257161969 has 2 divisors, whose sum is σ = 257161970. Its totient is φ = 257161968.

The previous prime is 257161967. The next prime is 257161999. The reversal of 257161969 is 969161752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158457744 + 98704225 = 12588^2 + 9935^2 .

It is a cyclic number.

It is not a de Polignac number, because 257161969 - 2¹ = 257161967 is a prime.

It is a super-2 number, since 2×257161969² = 132264556599913922, which contains 22 as substring.

Together with 257161967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (257161967) 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, 128580984 + 128580985.

It is an arithmetic number, because the mean of its divisors is an integer number (128580985).

Almost surely, 2^257161969 is an apocalyptic number.

It is an amenable number.

257161969 is a deficient number, since it is larger than the sum of its proper divisors (1).

257161969 is an equidigital number, since it uses as much as digits as its factorization.

257161969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 46.

The square root of 257161969 is about 16036.2704205186. The cubic root of 257161969 is about 635.9196536623.

The spelling of 257161969 in words is "two hundred fifty-seven million, one hundred sixty-one thousand, nine hundred sixty-nine".