231622431 has 4 divisors (see below), whose sum is σ = 308829912. Its totient is φ = 154414952.

The previous prime is 231622427. The next prime is 231622471. The reversal of 231622431 is 134226132.

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 231622431 - 2² = 231622427 is a prime.

It is a super-2 number, since 2×231622431² = 107297901084699522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231622471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38603736 + ... + 38603741.

It is an arithmetic number, because the mean of its divisors is an integer number (77207478).

Almost surely, 2^231622431 is an apocalyptic number.

231622431 is a deficient number, since it is larger than the sum of its proper divisors (77207481).

231622431 is an equidigital number, since it uses as much as digits as its factorization.

231622431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77207480.

The product of its digits is 1728, while the sum is 24.

The square root of 231622431 is about 15219.1468551953. The cubic root of 231622431 is about 614.1298474794.

Adding to 231622431 its reverse (134226132), we get a palindrome (365848563).

The spelling of 231622431 in words is "two hundred thirty-one million, six hundred twenty-two thousand, four hundred thirty-one".