257377609 has 2 divisors, whose sum is σ = 257377610. Its totient is φ = 257377608.

The previous prime is 257377607. The next prime is 257377621. The reversal of 257377609 is 906773752.

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., 247118400 + 10259209 = 15720^2 + 3203^2 .

It is a cyclic number.

It is not a de Polignac number, because 257377609 - 2¹ = 257377607 is a prime.

It is a super-2 number, since 2×257377609² = 132486467229113762, which contains 22 as substring.

Together with 257377607, 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 (257377607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128688804 + 128688805.

It is an arithmetic number, because the mean of its divisors is an integer number (128688805).

Almost surely, 2^257377609 is an apocalyptic number.

It is an amenable number.

257377609 is a deficient number, since it is larger than the sum of its proper divisors (1).

257377609 is an equidigital number, since it uses as much as digits as its factorization.

257377609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 555660, while the sum is 46.

The square root of 257377609 is about 16042.9925201005. The cubic root of 257377609 is about 636.0973515324.

The spelling of 257377609 in words is "two hundred fifty-seven million, three hundred seventy-seven thousand, six hundred nine".