263971963 has 2 divisors, whose sum is σ = 263971964. Its totient is φ = 263971962.

The previous prime is 263971957. The next prime is 263971973. The reversal of 263971963 is 369179362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 263971963 - 2⁹ = 263971451 is a prime.

It is not a weakly prime, because it can be changed into another prime (263971933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131985981 + 131985982.

It is an arithmetic number, because the mean of its divisors is an integer number (131985982).

Almost surely, 2^263971963 is an apocalyptic number.

263971963 is a deficient number, since it is larger than the sum of its proper divisors (1).

263971963 is an equidigital number, since it uses as much as digits as its factorization.

263971963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 46.

The square root of 263971963 is about 16247.2140073306. The cubic root of 263971963 is about 641.4841556901.

The spelling of 263971963 in words is "two hundred sixty-three million, nine hundred seventy-one thousand, nine hundred sixty-three".