231013331 has 4 divisors (see below), whose sum is σ = 231164592. Its totient is φ = 230862072.

The previous prime is 231013327. The next prime is 231013351. The reversal of 231013331 is 133310132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231013331 - 2² = 231013327 is a prime.

It is a super-2 number, since 2×231013331² = 106734318199431122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231013351) 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, 73316 + ... + 76401.

It is an arithmetic number, because the mean of its divisors is an integer number (57791148).

Almost surely, 2^231013331 is an apocalyptic number.

231013331 is a deficient number, since it is larger than the sum of its proper divisors (151261).

231013331 is a wasteful number, since it uses less digits than its factorization.

231013331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151260.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 231013331 is about 15199.1227049458. The cubic root of 231013331 is about 613.5910469497.

Adding to 231013331 its reverse (133310132), we get a palindrome (364323463).

The spelling of 231013331 in words is "two hundred thirty-one million, thirteen thousand, three hundred thirty-one".