13081997 has 2 divisors, whose sum is σ = 13081998. Its totient is φ = 13081996.

The previous prime is 13081973. The next prime is 13082023. The reversal of 13081997 is 79918031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 894916 = 3491^2 + 946^2 .

It is a cyclic number.

It is not a de Polignac number, because 13081997 - 2¹² = 13077901 is a prime.

It is a super-2 number, since 2×13081997² = 342277291016018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13081997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13081097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6540998 + 6540999.

It is an arithmetic number, because the mean of its divisors is an integer number (6540999).

Almost surely, 2^13081997 is an apocalyptic number.

It is an amenable number.

13081997 is a deficient number, since it is larger than the sum of its proper divisors (1).

13081997 is an equidigital number, since it uses as much as digits as its factorization.

13081997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 13081997 is about 3616.9043393488. The cubic root of 13081997 is about 235.6267981063.

The spelling of 13081997 in words is "thirteen million, eighty-one thousand, nine hundred ninety-seven".