257261861 has 8 divisors (see below), whose sum is σ = 259705248. Its totient is φ = 254826000.

The previous prime is 257261821. The next prime is 257261863. The reversal of 257261861 is 168162752.

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 257261861 - 2¹⁴ = 257245477 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 (257261863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85106 + ... + 88076.

It is an arithmetic number, because the mean of its divisors is an integer number (32463156).

Almost surely, 2^257261861 is an apocalyptic number.

It is an amenable number.

257261861 is a deficient number, since it is larger than the sum of its proper divisors (2443387).

257261861 is a wasteful number, since it uses less digits than its factorization.

257261861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3763.

The product of its digits is 40320, while the sum is 38.

The square root of 257261861 is about 16039.3846827115. The cubic root of 257261861 is about 636.0019818840.

The spelling of 257261861 in words is "two hundred fifty-seven million, two hundred sixty-one thousand, eight hundred sixty-one".