1551313131 has 12 divisors (see below), whose sum is σ = 2162260968. Its totient is φ = 989242144.

The previous prime is 1551313123. The next prime is 1551313199. The reversal of 1551313131 is 1313131551.

It is a happy number.

It is not a de Polignac number, because 1551313131 - 2³ = 1551313123 is a prime.

It is a super-2 number, since 2×1551313131² = 4813144860826046322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1551313831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 487170 + ... + 490343.

It is an arithmetic number, because the mean of its divisors is an integer number (180188414).

Almost surely, 2^1551313131 is an apocalyptic number.

1551313131 is a deficient number, since it is larger than the sum of its proper divisors (610947837).

1551313131 is an equidigital number, since it uses as much as digits as its factorization.

1551313131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977562 (or 977539 counting only the distinct ones).

The product of its digits is 675, while the sum is 24.

The square root of 1551313131 is about 39386.7126198671. The cubic root of 1551313131 is about 1157.6212477734.

Adding to 1551313131 its reverse (1313131551), we get a palindrome (2864444682).

The spelling of 1551313131 in words is "one billion, five hundred fifty-one million, three hundred thirteen thousand, one hundred thirty-one".