13170581 has 2 divisors, whose sum is σ = 13170582. Its totient is φ = 13170580.

The previous prime is 13170551. The next prime is 13170583. The reversal of 13170581 is 18507131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12666481 + 504100 = 3559^2 + 710^2 .

It is an emirp because it is prime and its reverse (18507131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13170581 - 2¹⁸ = 12908437 is a prime.

It is a super-2 number, since 2×13170581² = 346928407755122, which contains 22 as substring.

Together with 13170583, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13170581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13170583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6585290 + 6585291.

It is an arithmetic number, because the mean of its divisors is an integer number (6585291).

Almost surely, 2^13170581 is an apocalyptic number.

It is an amenable number.

13170581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13170581 is an equidigital number, since it uses as much as digits as its factorization.

13170581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 13170581 is about 3629.1295099514. The cubic root of 13170581 is about 236.1574466459.

The spelling of 13170581 in words is "thirteen million, one hundred seventy thousand, five hundred eighty-one".