257405061 has 8 divisors (see below), whose sum is σ = 344719584. Its totient is φ = 170846960.

The previous prime is 257405039. The next prime is 257405069. The reversal of 257405061 is 160504752.

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 257405061 - 2¹⁸ = 257142917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257405069) 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, 188310 + ... + 189671.

It is an arithmetic number, because the mean of its divisors is an integer number (43089948).

Almost surely, 2^257405061 is an apocalyptic number.

It is an amenable number.

257405061 is a deficient number, since it is larger than the sum of its proper divisors (87314523).

257405061 is a wasteful number, since it uses less digits than its factorization.

257405061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378211.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 257405061 is about 16043.8480733270. The cubic root of 257405061 is about 636.1199661954.

The spelling of 257405061 in words is "two hundred fifty-seven million, four hundred five thousand, sixty-one".