263392891 has 2 divisors, whose sum is σ = 263392892. Its totient is φ = 263392890.

The previous prime is 263392861. The next prime is 263392903. The reversal of 263392891 is 198293362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 263392891 - 2⁵ = 263392859 is a prime.

It is not a weakly prime, because it can be changed into another prime (263392861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131696445 + 131696446.

It is an arithmetic number, because the mean of its divisors is an integer number (131696446).

Almost surely, 2^263392891 is an apocalyptic number.

263392891 is a deficient number, since it is larger than the sum of its proper divisors (1).

263392891 is an equidigital number, since it uses as much as digits as its factorization.

263392891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 263392891 is about 16229.3835680842. The cubic root of 263392891 is about 641.0147403443.

The spelling of 263392891 in words is "two hundred sixty-three million, three hundred ninety-two thousand, eight hundred ninety-one".