263971957 has 2 divisors, whose sum is σ = 263971958. Its totient is φ = 263971956.

The previous prime is 263971933. The next prime is 263971963. The reversal of 263971957 is 759179362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255712081 + 8259876 = 15991^2 + 2874^2 .

It is a cyclic number.

It is not a de Polignac number, because 263971957 - 2¹⁵ = 263939189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 263971957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263977957) 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, 131985978 + 131985979.

It is an arithmetic number, because the mean of its divisors is an integer number (131985979).

Almost surely, 2^263971957 is an apocalyptic number.

It is an amenable number.

263971957 is a deficient number, since it is larger than the sum of its proper divisors (1).

263971957 is an equidigital number, since it uses as much as digits as its factorization.

263971957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 49.

The square root of 263971957 is about 16247.2138226836. The cubic root of 263971957 is about 641.4841508299.

The spelling of 263971957 in words is "two hundred sixty-three million, nine hundred seventy-one thousand, nine hundred fifty-seven".