257139961 has 8 divisors (see below), whose sum is σ = 282812544. Its totient is φ = 232309200.

The previous prime is 257139929. The next prime is 257139979. The reversal of 257139961 is 169931752.

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 257139961 - 2⁵ = 257139929 is a prime.

It is a super-2 number, since 2×257139961² = 132241919086163042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257139661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209815 + ... + 211036.

It is an arithmetic number, because the mean of its divisors is an integer number (35351568).

Almost surely, 2^257139961 is an apocalyptic number.

It is an amenable number.

257139961 is a deficient number, since it is larger than the sum of its proper divisors (25672583).

257139961 is a wasteful number, since it uses less digits than its factorization.

257139961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420911.

The product of its digits is 102060, while the sum is 43.

The square root of 257139961 is about 16035.5842113719. The cubic root of 257139961 is about 635.9015124119.

The spelling of 257139961 in words is "two hundred fifty-seven million, one hundred thirty-nine thousand, nine hundred sixty-one".