13613551 has 8 divisors (see below), whose sum is σ = 15772064. Its totient is φ = 11508480.

The previous prime is 13613533. The next prime is 13613563. The reversal of 13613551 is 15531631.

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 13613551 - 2¹⁵ = 13580783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13613531) 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, 12810 + ... + 13831.

It is an arithmetic number, because the mean of its divisors is an integer number (1971508).

Almost surely, 2^13613551 is an apocalyptic number.

13613551 is a deficient number, since it is larger than the sum of its proper divisors (2158513).

13613551 is an equidigital number, since it uses as much as digits as its factorization.

13613551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26721.

The product of its digits is 1350, while the sum is 25.

The square root of 13613551 is about 3689.6545908797. The cubic root of 13613551 is about 238.7758909451.

The spelling of 13613551 in words is "thirteen million, six hundred thirteen thousand, five hundred fifty-one".