12564392281 has 27 divisors (see below), whose sum is σ = 14899462389. Its totient is φ = 10564352568.

The previous prime is 12564392261. The next prime is 12564392297. The reversal of 12564392281 is 18229346521.

The square root of 12564392281 is 112091.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 12564392281 - 2²³ = 12556003673 is a prime.

It is a super-2 number, since 2×12564392281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12564392251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 52570560 + ... + 52570798.

Almost surely, 2^12564392281 is an apocalyptic number.

12564392281 is the 112091-st square number.

12564392281 is the 56046-th centered octagonal number.

It is an amenable number.

12564392281 is a deficient number, since it is larger than the sum of its proper divisors (2335070108).

12564392281 is an frugal number, since it uses more digits than its factorization.

12564392281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 313 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The spelling of 12564392281 in words is "twelve billion, five hundred sixty-four million, three hundred ninety-two thousand, two hundred eighty-one".