15113981 has 2 divisors, whose sum is σ = 15113982. Its totient is φ = 15113980.

The previous prime is 15113963. The next prime is 15113999. The reversal of 15113981 is 18931151.

It is a balanced prime because it is at equal distance from previous prime (15113963) and next prime (15113999).

It can be written as a sum of positive squares in only one way, i.e., 14182756 + 931225 = 3766^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 15113981 - 2¹⁴ = 15097597 is a prime.

It is a super-2 number, since 2×15113981² = 456864843336722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15113281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7556990 + 7556991.

It is an arithmetic number, because the mean of its divisors is an integer number (7556991).

Almost surely, 2^15113981 is an apocalyptic number.

It is an amenable number.

15113981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15113981 is an equidigital number, since it uses as much as digits as its factorization.

15113981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 29.

The square root of 15113981 is about 3887.6703821183. The cubic root of 15113981 is about 247.2443014428.

The spelling of 15113981 in words is "fifteen million, one hundred thirteen thousand, nine hundred eighty-one".