231400521 has 36 divisors (see below), whose sum is σ = 371140224. Its totient is φ = 138813840.

The previous prime is 231400489. The next prime is 231400529. The reversal of 231400521 is 125004132.

231400521 is a `hidden beast` number, since 2 + 3 + 140 + 0 + 521 = 666.

231400521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231400521 - 2⁵ = 231400489 is a prime.

It is a super-2 number, since 2×231400521² = 107092402238142882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231400494 and 231400503.

It is not an unprimeable number, because it can be changed into a prime (231400529) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 111136 + ... + 113198.

Almost surely, 2^231400521 is an apocalyptic number.

It is an amenable number.

231400521 is a deficient number, since it is larger than the sum of its proper divisors (139739703).

231400521 is a wasteful number, since it uses less digits than its factorization.

231400521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194 (or 2180 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 231400521 is about 15211.8546206569. The cubic root of 231400521 is about 613.9336587951.

Adding to 231400521 its reverse (125004132), we get a palindrome (356404653).

The spelling of 231400521 in words is "two hundred thirty-one million, four hundred thousand, five hundred twenty-one".