263157857 has 2 divisors, whose sum is σ = 263157858. Its totient is φ = 263157856.

The previous prime is 263157827. The next prime is 263157859. The reversal of 263157857 is 758751362.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190550416 + 72607441 = 13804^2 + 8521^2 .

It is a cyclic number.

It is not a de Polignac number, because 263157857 - 2⁶ = 263157793 is a prime.

Together with 263157859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (263157859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131578928 + 131578929.

It is an arithmetic number, because the mean of its divisors is an integer number (131578929).

Almost surely, 2^263157857 is an apocalyptic number.

It is an amenable number.

263157857 is a deficient number, since it is larger than the sum of its proper divisors (1).

263157857 is an equidigital number, since it uses as much as digits as its factorization.

263157857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 44.

The square root of 263157857 is about 16222.1409499486. The cubic root of 263157857 is about 640.8240175383.

The spelling of 263157857 in words is "two hundred sixty-three million, one hundred fifty-seven thousand, eight hundred fifty-seven".