231137004 has 48 divisors (see below), whose sum is σ = 617109248. Its totient is φ = 65959488.

The previous prime is 231137003. The next prime is 231137009. The reversal of 231137004 is 400731132.

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

It is not an unprimeable number, because it can be changed into a prime (231137003) 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, 133287 + ... + 135009.

Almost surely, 2^231137004 is an apocalyptic number.

It is an amenable number.

231137004 is an abundant number, since it is smaller than the sum of its proper divisors (385972244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231137004 is a wasteful number, since it uses less digits than its factorization.

231137004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334 (or 3332 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 231137004 is about 15203.1905861895. The cubic root of 231137004 is about 613.7005227501.

Adding to 231137004 its reverse (400731132), we get a palindrome (631868136).

The spelling of 231137004 in words is "two hundred thirty-one million, one hundred thirty-seven thousand, four".