1551131131 has 32 divisors (see below), whose sum is σ = 1790350848. Its totient is φ = 1331043840.

The previous prime is 1551131111. The next prime is 1551131143. The reversal of 1551131131 is 1311311551.

It is a cyclic number.

It is not a de Polignac number, because 1551131131 - 2⁹ = 1551130619 is a prime.

It is a super-2 number, since 2×1551131131² = 4812015571114678322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1551131111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4602595 + ... + 4602931.

It is an arithmetic number, because the mean of its divisors is an integer number (55948464).

Almost surely, 2^1551131131 is an apocalyptic number.

1551131131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1551131131 is a deficient number, since it is larger than the sum of its proper divisors (239219717).

1551131131 is a wasteful number, since it uses less digits than its factorization.

1551131131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691.

The product of its digits is 225, while the sum is 22.

The square root of 1551131131 is about 39384.4021282538. The cubic root of 1551131131 is about 1157.5759753087.

Adding to 1551131131 its reverse (1311311551), we get a palindrome (2862442682).

The spelling of 1551131131 in words is "one billion, five hundred fifty-one million, one hundred thirty-one thousand, one hundred thirty-one".