131521004 has 12 divisors (see below), whose sum is σ = 235514664. Its totient is φ = 64231104.

The previous prime is 131520997. The next prime is 131521007. The reversal of 131521004 is 400125131.

131521004 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (131521007) 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, 382157 + ... + 382500.

It is an arithmetic number, because the mean of its divisors is an integer number (19626222).

Almost surely, 2^131521004 is an apocalyptic number.

It is an amenable number.

131521004 is a deficient number, since it is larger than the sum of its proper divisors (103993660).

131521004 is a wasteful number, since it uses less digits than its factorization.

131521004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764704 (or 764702 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 131521004 is about 11468.2607225333. The cubic root of 131521004 is about 508.5477125215.

Adding to 131521004 its reverse (400125131), we get a palindrome (531646135).

The spelling of 131521004 in words is "one hundred thirty-one million, five hundred twenty-one thousand, four".