1551345131 has 4 divisors (see below), whose sum is σ = 1772965872. Its totient is φ = 1329724392.

The previous prime is 1551345113. The next prime is 1551345137. The reversal of 1551345131 is 1315431551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1315431551 = 7 ⋅187918793.

It is a cyclic number.

It is not a de Polignac number, because 1551345131 - 2¹⁸ = 1551082987 is a prime.

It is a super-2 number, since 2×1551345131² = 4813343430954814322, 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 = 1551345094 and 1551345103.

It is not an unprimeable number, because it can be changed into a prime (1551345137) 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, 110810360 + ... + 110810373.

It is an arithmetic number, because the mean of its divisors is an integer number (443241468).

Almost surely, 2^1551345131 is an apocalyptic number.

1551345131 is a deficient number, since it is larger than the sum of its proper divisors (221620741).

1551345131 is an equidigital number, since it uses as much as digits as its factorization.

1551345131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221620740.

The product of its digits is 4500, while the sum is 29.

The square root of 1551345131 is about 39387.1188461405. The cubic root of 1551345131 is about 1157.6292074012.

Adding to 1551345131 its reverse (1315431551), we get a palindrome (2866776682).

The spelling of 1551345131 in words is "one billion, five hundred fifty-one million, three hundred forty-five thousand, one hundred thirty-one".