257795137 has 4 divisors (see below), whose sum is σ = 260160340. Its totient is φ = 255429936.

The previous prime is 257795119. The next prime is 257795143. The reversal of 257795137 is 731597752.

257795137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 16056²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 179667216 + 78127921 = 13404^2 + 8839^2 .

It is a cyclic number.

It is not a de Polignac number, because 257795137 - 2⁷ = 257795009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257795117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1182438 + ... + 1182655.

It is an arithmetic number, because the mean of its divisors is an integer number (65040085).

Almost surely, 2^257795137 is an apocalyptic number.

It is an amenable number.

257795137 is a deficient number, since it is larger than the sum of its proper divisors (2365203).

257795137 is a wasteful number, since it uses less digits than its factorization.

257795137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365202.

The product of its digits is 463050, while the sum is 46.

The square root of 257795137 is about 16056.0000311410. Note that the first 4 decimals coincide. The cubic root of 257795137 is about 636.4411330153.

The spelling of 257795137 in words is "two hundred fifty-seven million, seven hundred ninety-five thousand, one hundred thirty-seven".