12615981 has 24 divisors (see below), whose sum is σ = 20602080. Its totient is φ = 6828192.

The previous prime is 12615949. The next prime is 12615991. The reversal of 12615981 is 18951621.

It is not a de Polignac number, because 12615981 - 2⁵ = 12615949 is a prime.

It is a super-2 number, since 2×12615981² = 318325953184722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12615931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 535 + ... + 5051.

It is an arithmetic number, because the mean of its divisors is an integer number (858420).

Almost surely, 2^12615981 is an apocalyptic number.

It is an amenable number.

12615981 is a deficient number, since it is larger than the sum of its proper divisors (7986099).

12615981 is a wasteful number, since it uses less digits than its factorization.

12615981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553 (or 4546 counting only the distinct ones).

The product of its digits is 4320, while the sum is 33.

The square root of 12615981 is about 3551.8982248933. The cubic root of 12615981 is about 232.7950145660.

The spelling of 12615981 in words is "twelve million, six hundred fifteen thousand, nine hundred eighty-one".