257193381 has 8 divisors (see below), whose sum is σ = 347622400. Its totient is φ = 169113312.

The previous prime is 257193379. The next prime is 257193403. The reversal of 257193381 is 183391752.

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

It is not a de Polignac number, because 257193381 - 2¹ = 257193379 is a prime.

It is a super-2 number, since 2×257193381² = 132296870460422322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257193301) 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, 586981 + ... + 587418.

It is an arithmetic number, because the mean of its divisors is an integer number (43452800).

Almost surely, 2^257193381 is an apocalyptic number.

It is an amenable number.

257193381 is a deficient number, since it is larger than the sum of its proper divisors (90429019).

257193381 is a wasteful number, since it uses less digits than its factorization.

257193381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174475.

The product of its digits is 45360, while the sum is 39.

The square root of 257193381 is about 16037.2497953982. The cubic root of 257193381 is about 635.9455448610.

The spelling of 257193381 in words is "two hundred fifty-seven million, one hundred ninety-three thousand, three hundred eighty-one".