257981534 has 4 divisors (see below), whose sum is σ = 386972304. Its totient is φ = 128990766.

The previous prime is 257981509. The next prime is 257981539. The reversal of 257981534 is 435189752.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257981539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64495382 + ... + 64495385.

It is an arithmetic number, because the mean of its divisors is an integer number (96743076).

Almost surely, 2^257981534 is an apocalyptic number.

257981534 is a deficient number, since it is larger than the sum of its proper divisors (128990770).

257981534 is a wasteful number, since it uses less digits than its factorization.

257981534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128990769.

The product of its digits is 302400, while the sum is 44.

The square root of 257981534 is about 16061.8035724510. The cubic root of 257981534 is about 636.5944875213.

The spelling of 257981534 in words is "two hundred fifty-seven million, nine hundred eighty-one thousand, five hundred thirty-four".