257561207 has 8 divisors (see below), whose sum is σ = 273254400. Its totient is φ = 242081784.

The previous prime is 257561197. The next prime is 257561219. The reversal of 257561207 is 702165752.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257561207 - 2⁴ = 257561191 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 (257561257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50957 + ... + 55782.

It is an arithmetic number, because the mean of its divisors is an integer number (34156800).

Almost surely, 2^257561207 is an apocalyptic number.

257561207 is a deficient number, since it is larger than the sum of its proper divisors (15693193).

257561207 is a wasteful number, since it uses less digits than its factorization.

257561207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106885.

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 257561207 is about 16048.7135621520. The cubic root of 257561207 is about 636.2485670215.

The spelling of 257561207 in words is "two hundred fifty-seven million, five hundred sixty-one thousand, two hundred seven".