12599981 has 12 divisors (see below), whose sum is σ = 13388160. Its totient is φ = 11842440.

The previous prime is 12599969. The next prime is 12599987. The reversal of 12599981 is 18999521.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12599981 is a prime.

It is a super-2 number, since 2×12599981² = 317519042400722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12599987) 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, 151766 + ... + 151848.

It is an arithmetic number, because the mean of its divisors is an integer number (1115680).

Almost surely, 2^12599981 is an apocalyptic number.

It is an amenable number.

12599981 is a deficient number, since it is larger than the sum of its proper divisors (788179).

12599981 is an frugal number, since it uses more digits than its factorization.

12599981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 173 counting only the distinct ones).

The product of its digits is 58320, while the sum is 44.

The square root of 12599981 is about 3549.6451935370. The cubic root of 12599981 is about 232.6965601811.

The spelling of 12599981 in words is "twelve million, five hundred ninety-nine thousand, nine hundred eighty-one".