15112981 has 4 divisors (see below), whose sum is σ = 16275532. Its totient is φ = 13950432.

The previous prime is 15112967. The next prime is 15112997. The reversal of 15112981 is 18921151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18921151 = 241 ⋅78511.

It can be written as a sum of positive squares in 2 ways, for example, as 9548100 + 5564881 = 3090^2 + 2359^2 .

It is a cyclic number.

It is not a de Polignac number, because 15112981 - 2²³ = 6724373 is a prime.

It is a super-2 number, since 2×15112981² = 456804389412722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15112481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581256 + ... + 581281.

It is an arithmetic number, because the mean of its divisors is an integer number (4068883).

Almost surely, 2^15112981 is an apocalyptic number.

It is an amenable number.

15112981 is a deficient number, since it is larger than the sum of its proper divisors (1162551).

15112981 is a wasteful number, since it uses less digits than its factorization.

15112981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162550.

The product of its digits is 720, while the sum is 28.

The square root of 15112981 is about 3887.5417682644. The cubic root of 15112981 is about 247.2388484397.

The spelling of 15112981 in words is "fifteen million, one hundred twelve thousand, nine hundred eighty-one".