231431431 has 16 divisors (see below), whose sum is σ = 294681600. Its totient is φ = 176496480.

The previous prime is 231431413. The next prime is 231431449. The reversal of 231431431 is 134134132.

It is an interprime number because it is at equal distance from previous prime (231431413) and next prime (231431449).

It is a cyclic number.

It is not a de Polignac number, because 231431431 - 2¹³ = 231423239 is a prime.

It is a super-2 number, since 2×231431431² = 107121014509415522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231431401) 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, 28356 + ... + 35593.

It is an arithmetic number, because the mean of its divisors is an integer number (18417600).

Almost surely, 2^231431431 is an apocalyptic number.

231431431 is a deficient number, since it is larger than the sum of its proper divisors (63250169).

231431431 is a wasteful number, since it uses less digits than its factorization.

231431431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64014.

The product of its digits is 864, while the sum is 22.

The square root of 231431431 is about 15212.8705706714. The cubic root of 231431431 is about 613.9609935715.

Adding to 231431431 its reverse (134134132), we get a palindrome (365565563).

The spelling of 231431431 in words is "two hundred thirty-one million, four hundred thirty-one thousand, four hundred thirty-one".