13791581 has 2 divisors, whose sum is σ = 13791582. Its totient is φ = 13791580.

The previous prime is 13791571. The next prime is 13791601. The reversal of 13791581 is 18519731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13623481 + 168100 = 3691^2 + 410^2 .

It is an emirp because it is prime and its reverse (18519731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13791581 - 2⁶ = 13791517 is a prime.

It is a super-2 number, since 2×13791581² = 380415412959122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13791521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6895790 + 6895791.

It is an arithmetic number, because the mean of its divisors is an integer number (6895791).

Almost surely, 2^13791581 is an apocalyptic number.

It is an amenable number.

13791581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13791581 is an equidigital number, since it uses as much as digits as its factorization.

13791581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 35.

The square root of 13791581 is about 3713.7017920129. The cubic root of 13791581 is about 239.8122431987.

The spelling of 13791581 in words is "thirteen million, seven hundred ninety-one thousand, five hundred eighty-one".