257173149 has 4 divisors (see below), whose sum is σ = 342897536. Its totient is φ = 171448764.

The previous prime is 257173139. The next prime is 257173157. The reversal of 257173149 is 941371752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 257173149 - 2⁸ = 257172893 is a prime.

It is a super-2 number, since 2×257173149² = 132276057133152402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257173129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42862189 + ... + 42862194.

It is an arithmetic number, because the mean of its divisors is an integer number (85724384).

Almost surely, 2^257173149 is an apocalyptic number.

It is an amenable number.

257173149 is a deficient number, since it is larger than the sum of its proper divisors (85724387).

257173149 is an equidigital number, since it uses as much as digits as its factorization.

257173149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85724386.

The product of its digits is 52920, while the sum is 39.

The square root of 257173149 is about 16036.6190015227. The cubic root of 257173149 is about 635.9288689683.

The spelling of 257173149 in words is "two hundred fifty-seven million, one hundred seventy-three thousand, one hundred forty-nine".