1555142201 has 4 divisors (see below), whose sum is σ = 1646621172. Its totient is φ = 1463663232.

The previous prime is 1555142189. The next prime is 1555142203. The reversal of 1555142201 is 1022415551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 768620176 + 786522025 = 27724^2 + 28045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555142201 is a prime.

It is a super-2 number, since 2×1555142201² = 4836934530662248802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555142203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45739460 + ... + 45739493.

It is an arithmetic number, because the mean of its divisors is an integer number (411655293).

Almost surely, 2^1555142201 is an apocalyptic number.

It is an amenable number.

1555142201 is a deficient number, since it is larger than the sum of its proper divisors (91478971).

1555142201 is an equidigital number, since it uses as much as digits as its factorization.

1555142201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91478970.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1555142201 is about 39435.2913137459. The cubic root of 1555142201 is about 1158.5729083857.

Adding to 1555142201 its reverse (1022415551), we get a palindrome (2577557752).

The spelling of 1555142201 in words is "one billion, five hundred fifty-five million, one hundred forty-two thousand, two hundred one".