231402529 has 4 divisors (see below), whose sum is σ = 231433920. Its totient is φ = 231371140.

The previous prime is 231402511. The next prime is 231402533. The reversal of 231402529 is 925204132.

231402529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 231402529 - 2⁵ = 231402497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231402497 and 231402506.

It is not an unprimeable number, because it can be changed into a prime (231402559) 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, 2052 + ... + 21610.

It is an arithmetic number, because the mean of its divisors is an integer number (57858480).

Almost surely, 2^231402529 is an apocalyptic number.

It is an amenable number.

231402529 is a deficient number, since it is larger than the sum of its proper divisors (31391).

231402529 is a wasteful number, since it uses less digits than its factorization.

231402529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31390.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 231402529 is about 15211.9206216704. The cubic root of 231402529 is about 613.9354346125.

The spelling of 231402529 in words is "two hundred thirty-one million, four hundred two thousand, five hundred twenty-nine".