12537981 has 12 divisors (see below), whose sum is σ = 18695040. Its totient is φ = 8088840.

The previous prime is 12537977. The next prime is 12537989. The reversal of 12537981 is 18973521.

It is not a de Polignac number, because 12537981 - 2² = 12537977 is a prime.

It is a super-2 number, since 2×12537981² = 314401935112722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12537989) 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, 22191 + ... + 22748.

It is an arithmetic number, because the mean of its divisors is an integer number (1557920).

Almost surely, 2^12537981 is an apocalyptic number.

It is an amenable number.

12537981 is a deficient number, since it is larger than the sum of its proper divisors (6157059).

12537981 is a wasteful number, since it uses less digits than its factorization.

12537981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44976 (or 44973 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 12537981 is about 3540.9011564855. The cubic root of 12537981 is about 232.3142602578.

The spelling of 12537981 in words is "twelve million, five hundred thirty-seven thousand, nine hundred eighty-one".