257226997 has 16 divisors (see below), whose sum is σ = 279120640. Its totient is φ = 236219328.

The previous prime is 257226979. The next prime is 257227001. The reversal of 257226997 is 799622752.

It is a cyclic number.

It is not a de Polignac number, because 257226997 - 2¹⁵ = 257194229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257226997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257226097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257503 + ... + 258499.

It is an arithmetic number, because the mean of its divisors is an integer number (17445040).

Almost surely, 2^257226997 is an apocalyptic number.

It is an amenable number.

257226997 is a deficient number, since it is larger than the sum of its proper divisors (21893643).

257226997 is a wasteful number, since it uses less digits than its factorization.

257226997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420.

The product of its digits is 952560, while the sum is 49.

The square root of 257226997 is about 16038.2978211530. The cubic root of 257226997 is about 635.9732503616.

The spelling of 257226997 in words is "two hundred fifty-seven million, two hundred twenty-six thousand, nine hundred ninety-seven".