13100981 has 2 divisors, whose sum is σ = 13100982. Its totient is φ = 13100980.

The previous prime is 13100977. The next prime is 13101019. The reversal of 13100981 is 18900131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12780625 + 320356 = 3575^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 13100981 - 2² = 13100977 is a prime.

It is a super-2 number, since 2×13100981² = 343271406324722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13100951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6550490 + 6550491.

It is an arithmetic number, because the mean of its divisors is an integer number (6550491).

Almost surely, 2^13100981 is an apocalyptic number.

It is an amenable number.

13100981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13100981 is an equidigital number, since it uses as much as digits as its factorization.

13100981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 13100981 is about 3619.5277316247. The cubic root of 13100981 is about 235.7407199879.

The spelling of 13100981 in words is "thirteen million, one hundred thousand, nine hundred eighty-one".