231513231 has 8 divisors (see below), whose sum is σ = 308810880. Its totient is φ = 154278872.

The previous prime is 231513221. The next prime is 231513283. The reversal of 231513231 is 132315132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231513231 - 2⁵ = 231513199 is a prime.

It is a super-2 number, since 2×231513231² = 107196752256118722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231513198 and 231513207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231513221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6501 + ... + 22478.

It is an arithmetic number, because the mean of its divisors is an integer number (38601360).

Almost surely, 2^231513231 is an apocalyptic number.

231513231 is a deficient number, since it is larger than the sum of its proper divisors (77297649).

231513231 is a wasteful number, since it uses less digits than its factorization.

231513231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31645.

The product of its digits is 540, while the sum is 21.

The square root of 231513231 is about 15215.5588461285. The cubic root of 231513231 is about 614.0333203844.

Adding to 231513231 its reverse (132315132), we get a palindrome (363828363).

The spelling of 231513231 in words is "two hundred thirty-one million, five hundred thirteen thousand, two hundred thirty-one".