263257831 has 2 divisors, whose sum is σ = 263257832. Its totient is φ = 263257830.

The previous prime is 263257829. The next prime is 263257873. The reversal of 263257831 is 138752362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 263257831 - 2¹ = 263257829 is a prime.

It is a super-2 number, since 2×263257831² = 138609371165649122, which contains 22 as substring.

Together with 263257829, 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 (263257811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131628915 + 131628916.

It is an arithmetic number, because the mean of its divisors is an integer number (131628916).

Almost surely, 2^263257831 is an apocalyptic number.

263257831 is a deficient number, since it is larger than the sum of its proper divisors (1).

263257831 is an equidigital number, since it uses as much as digits as its factorization.

263257831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 263257831 is about 16225.2220631953. Note that the first 3 decimals coincide. The cubic root of 263257831 is about 640.9051572135.

The spelling of 263257831 in words is "two hundred sixty-three million, two hundred fifty-seven thousand, eight hundred thirty-one".