1521133131 has 16 divisors (see below), whose sum is σ = 2318932224. Its totient is φ = 868838304.

The previous prime is 1521133111. The next prime is 1521133177. The reversal of 1521133131 is 1313311251.

It is not a de Polignac number, because 1521133131 - 2⁵ = 1521133099 is a prime.

It is a super-2 number, since 2×1521133131² = 4627692004451726322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1521133098 and 1521133107.

It is not an unprimeable number, because it can be changed into a prime (1521133111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37396 + ... + 66638.

It is an arithmetic number, because the mean of its divisors is an integer number (144933264).

Almost surely, 2^1521133131 is an apocalyptic number.

1521133131 is a deficient number, since it is larger than the sum of its proper divisors (797799093).

1521133131 is a wasteful number, since it uses less digits than its factorization.

1521133131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31730.

The product of its digits is 270, while the sum is 21.

The square root of 1521133131 is about 39001.7067703453. The cubic root of 1521133131 is about 1150.0650576932.

Adding to 1521133131 its reverse (1313311251), we get a palindrome (2834444382).

The spelling of 1521133131 in words is "one billion, five hundred twenty-one million, one hundred thirty-three thousand, one hundred thirty-one".