814725257 has 4 divisors (see below), whose sum is σ = 833672400. Its totient is φ = 795778116.

The previous prime is 814725239. The next prime is 814725259. The reversal of 814725257 is 752527418.

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 814725257 - 2⁸ = 814725001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (814725259) 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, 9473507 + ... + 9473592.

It is an arithmetic number, because the mean of its divisors is an integer number (208418100).

Almost surely, 2^814725257 is an apocalyptic number.

It is an amenable number.

814725257 is a deficient number, since it is larger than the sum of its proper divisors (18947143).

814725257 is a wasteful number, since it uses less digits than its factorization.

814725257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18947142.

The product of its digits is 156800, while the sum is 41.

The square root of 814725257 is about 28543.3925278689. The cubic root of 814725257 is about 933.9788892575.

The spelling of 814725257 in words is "eight hundred fourteen million, seven hundred twenty-five thousand, two hundred fifty-seven".