257003681 has 4 divisors (see below), whose sum is σ = 280367664. Its totient is φ = 233639700.

The previous prime is 257003657. The next prime is 257003689. The reversal of 257003681 is 186300752.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 257003681 - 2²² = 252809377 is a prime.

It is a super-2 number, since 2×257003681² = 132101784095099522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257003689) 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, 11681975 + ... + 11681996.

It is an arithmetic number, because the mean of its divisors is an integer number (70091916).

Almost surely, 2^257003681 is an apocalyptic number.

It is an amenable number.

257003681 is a deficient number, since it is larger than the sum of its proper divisors (23363983).

257003681 is a wasteful number, since it uses less digits than its factorization.

257003681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23363982.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 257003681 is about 16031.3343487060. The cubic root of 257003681 is about 635.7891534047.

The spelling of 257003681 in words is "two hundred fifty-seven million, three thousand, six hundred eighty-one".