13977581 has 2 divisors, whose sum is σ = 13977582. Its totient is φ = 13977580.

The previous prime is 13977563. The next prime is 13977589. The reversal of 13977581 is 18577931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13756681 + 220900 = 3709^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 13977581 - 2¹⁸ = 13715437 is a prime.

It is a super-2 number, since 2×13977581² = 390745541223122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13977589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6988790 + 6988791.

It is an arithmetic number, because the mean of its divisors is an integer number (6988791).

Almost surely, 2^13977581 is an apocalyptic number.

It is an amenable number.

13977581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13977581 is an equidigital number, since it uses as much as digits as its factorization.

13977581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 41.

The square root of 13977581 is about 3738.6603215590. The cubic root of 13977581 is about 240.8855077339.

The spelling of 13977581 in words is "thirteen million, nine hundred seventy-seven thousand, five hundred eighty-one".