257070769 has 2 divisors, whose sum is σ = 257070770. Its totient is φ = 257070768.

The previous prime is 257070767. The next prime is 257070791. The reversal of 257070769 is 967070752.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198471744 + 58599025 = 14088^2 + 7655^2 .

It is a cyclic number.

It is not a de Polignac number, because 257070769 - 2¹ = 257070767 is a prime.

It is a super-2 number, since 2×257070769² = 132170760548502722, which contains 22 as substring.

Together with 257070767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (257070763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128535384 + 128535385.

It is an arithmetic number, because the mean of its divisors is an integer number (128535385).

Almost surely, 2^257070769 is an apocalyptic number.

It is an amenable number.

257070769 is a deficient number, since it is larger than the sum of its proper divisors (1).

257070769 is an equidigital number, since it uses as much as digits as its factorization.

257070769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 257070769 is about 16033.4266144203. The cubic root of 257070769 is about 635.8444705266.

The spelling of 257070769 in words is "two hundred fifty-seven million, seventy thousand, seven hundred sixty-nine".