263340891 has 36 divisors (see below), whose sum is σ = 423535840. Its totient is φ = 157528800.

The previous prime is 263340881. The next prime is 263340929. The reversal of 263340891 is 198043362.

It is not a de Polignac number, because 263340891 - 2¹⁸ = 263078747 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263340811) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 84501 + ... + 87561.

Almost surely, 2^263340891 is an apocalyptic number.

263340891 is a deficient number, since it is larger than the sum of its proper divisors (160194949).

263340891 is a wasteful number, since it uses less digits than its factorization.

263340891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168 (or 3154 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 263340891 is about 16227.7814565023. The cubic root of 263340891 is about 640.9725537333.

The spelling of 263340891 in words is "two hundred sixty-three million, three hundred forty thousand, eight hundred ninety-one".