13401581 has 2 divisors, whose sum is σ = 13401582. Its totient is φ = 13401580.

The previous prime is 13401539. The next prime is 13401587. The reversal of 13401581 is 18510431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13213225 + 188356 = 3635^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 13401581 - 2²² = 9207277 is a prime.

It is a super-2 number, since 2×13401581² = 359204746599122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13401587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6700790 + 6700791.

It is an arithmetic number, because the mean of its divisors is an integer number (6700791).

Almost surely, 2^13401581 is an apocalyptic number.

It is an amenable number.

13401581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13401581 is an equidigital number, since it uses as much as digits as its factorization.

13401581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 13401581 is about 3660.8169853190. The cubic root of 13401581 is about 237.5301147409.

The spelling of 13401581 in words is "thirteen million, four hundred one thousand, five hundred eighty-one".