13601581 has 8 divisors (see below), whose sum is σ = 16459200. Its totient is φ = 10972608.

The previous prime is 13601563. The next prime is 13601593. The reversal of 13601581 is 18510631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13601581 - 2⁷ = 13601453 is a prime.

It is a super-2 number, since 2×13601581² = 370006011399122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13601501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57031 + ... + 57268.

It is an arithmetic number, because the mean of its divisors is an integer number (2057400).

Almost surely, 2^13601581 is an apocalyptic number.

It is an amenable number.

13601581 is a deficient number, since it is larger than the sum of its proper divisors (2857619).

13601581 is a wasteful number, since it uses less digits than its factorization.

13601581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114323.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 13601581 is about 3688.0321310965. The cubic root of 13601581 is about 238.7058875218.

The spelling of 13601581 in words is "thirteen million, six hundred one thousand, five hundred eighty-one".