257491701 has 6 divisors (see below), whose sum is σ = 371932470. Its totient is φ = 171661128.

The previous prime is 257491691. The next prime is 257491733. The reversal of 257491701 is 107194752.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 146168100 + 111323601 = 12090^2 + 10551^2 .

It is not a de Polignac number, because 257491701 - 2¹³ = 257483509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257491501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14305086 + ... + 14305103.

It is an arithmetic number, because the mean of its divisors is an integer number (61988745).

Almost surely, 2^257491701 is an apocalyptic number.

It is an amenable number.

257491701 is a deficient number, since it is larger than the sum of its proper divisors (114440769).

257491701 is a wasteful number, since it uses less digits than its factorization.

257491701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28610195 (or 28610192 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 257491701 is about 16046.5479465211. The cubic root of 257491701 is about 636.1913287543.

The spelling of 257491701 in words is "two hundred fifty-seven million, four hundred ninety-one thousand, seven hundred one".