231536479 has 2 divisors, whose sum is σ = 231536480. Its totient is φ = 231536478.

The previous prime is 231536477. The next prime is 231536507. The reversal of 231536479 is 974635132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231536479 - 2¹ = 231536477 is a prime.

It is a super-2 number, since 2×231536479² = 107218282215434882, which contains 22 as substring.

Together with 231536477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231536477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115768239 + 115768240.

It is an arithmetic number, because the mean of its divisors is an integer number (115768240).

Almost surely, 2^231536479 is an apocalyptic number.

231536479 is a deficient number, since it is larger than the sum of its proper divisors (1).

231536479 is an equidigital number, since it uses as much as digits as its factorization.

231536479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 40.

The square root of 231536479 is about 15216.3227818024. The cubic root of 231536479 is about 614.0538729446.

The spelling of 231536479 in words is "two hundred thirty-one million, five hundred thirty-six thousand, four hundred seventy-nine".