426556521 has 12 divisors (see below), whose sum is σ = 618537972. Its totient is φ = 283262976.

The previous prime is 426556519. The next prime is 426556523. The reversal of 426556521 is 125655624.

It is an interprime number because it is at equal distance from previous prime (426556519) and next prime (426556523).

It can be written as a sum of positive squares in 2 ways, for example, as 223921296 + 202635225 = 14964^2 + 14235^2 .

It is not a de Polignac number, because 426556521 - 2¹ = 426556519 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (426556523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89896 + ... + 94521.

It is an arithmetic number, because the mean of its divisors is an integer number (51544831).

Almost surely, 2^426556521 is an apocalyptic number.

It is an amenable number.

426556521 is a deficient number, since it is larger than the sum of its proper divisors (191981451).

426556521 is a wasteful number, since it uses less digits than its factorization.

426556521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184680 (or 184677 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 426556521 is about 20653.2448055989. The cubic root of 426556521 is about 752.7640356290.

The spelling of 426556521 in words is "four hundred twenty-six million, five hundred fifty-six thousand, five hundred twenty-one".