263890831 has 2 divisors, whose sum is σ = 263890832. Its totient is φ = 263890830.

The previous prime is 263890793. The next prime is 263890843. The reversal of 263890831 is 138098362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 263890831 - 2¹³ = 263882639 is a prime.

It is a super-2 number, since 2×263890831² = 139276741371741122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263890531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131945415 + 131945416.

It is an arithmetic number, because the mean of its divisors is an integer number (131945416).

Almost surely, 2^263890831 is an apocalyptic number.

263890831 is a deficient number, since it is larger than the sum of its proper divisors (1).

263890831 is an equidigital number, since it uses as much as digits as its factorization.

263890831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 263890831 is about 16244.7170181570. The cubic root of 263890831 is about 641.4184287283.

The spelling of 263890831 in words is "two hundred sixty-three million, eight hundred ninety thousand, eight hundred thirty-one".