1555073137 has 4 divisors (see below), whose sum is σ = 1557455220. Its totient is φ = 1552691056.

The previous prime is 1555073131. The next prime is 1555073141. The reversal of 1555073137 is 7313705551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7313705551 = 367 ⋅19928353.

It can be written as a sum of positive squares in 2 ways, for example, as 253956096 + 1301117041 = 15936^2 + 36071^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555073137 - 2²⁷ = 1420855409 is a prime.

It is a super-2 number, since 2×1555073137² = 4836504922838041538, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1555073096 and 1555073105.

It is not an unprimeable number, because it can be changed into a prime (1555073131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1190062 + ... + 1191367.

It is an arithmetic number, because the mean of its divisors is an integer number (389363805).

Almost surely, 2^1555073137 is an apocalyptic number.

It is an amenable number.

1555073137 is a deficient number, since it is larger than the sum of its proper divisors (2382083).

1555073137 is an equidigital number, since it uses as much as digits as its factorization.

1555073137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382082.

The product of its (nonzero) digits is 55125, while the sum is 37.

The square root of 1555073137 is about 39434.4156416702. The cubic root of 1555073137 is about 1158.5557573574. Note that the first 3 decimals are identical.

Adding to 1555073137 its reverse (7313705551), we get a palindrome (8868778688).

The spelling of 1555073137 in words is "one billion, five hundred fifty-five million, seventy-three thousand, one hundred thirty-seven".