257079197 has 4 divisors (see below), whose sum is σ = 259729596. Its totient is φ = 254428800.

The previous prime is 257079191. The next prime is 257079217. The reversal of 257079197 is 791970752.

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 170328601 + 86750596 = 13051^2 + 9314^2 .

It is a cyclic number.

It is not a de Polignac number, because 257079197 - 2⁶ = 257079133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257079191) 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, 1325054 + ... + 1325247.

It is an arithmetic number, because the mean of its divisors is an integer number (64932399).

Almost surely, 2^257079197 is an apocalyptic number.

It is an amenable number.

257079197 is a deficient number, since it is larger than the sum of its proper divisors (2650399).

257079197 is an equidigital number, since it uses as much as digits as its factorization.

257079197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650398.

The product of its (nonzero) digits is 277830, while the sum is 47.

The square root of 257079197 is about 16033.6894381798. The cubic root of 257079197 is about 635.8514191172.

The spelling of 257079197 in words is "two hundred fifty-seven million, seventy-nine thousand, one hundred ninety-seven".