13197561 has 16 divisors (see below), whose sum is σ = 19775616. Its totient is φ = 7767936.

The previous prime is 13197557. The next prime is 13197563. The reversal of 13197561 is 16579131.

It is a happy number.

13197561 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13197561 - 2² = 13197557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13197563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6460 + ... + 8253.

It is an arithmetic number, because the mean of its divisors is an integer number (1235976).

Almost surely, 2^13197561 is an apocalyptic number.

It is an amenable number.

13197561 is a deficient number, since it is larger than the sum of its proper divisors (6578055).

13197561 is a wasteful number, since it uses less digits than its factorization.

13197561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14752.

The product of its digits is 5670, while the sum is 33.

The square root of 13197561 is about 3632.8447530826. The cubic root of 13197561 is about 236.3185932233.

The spelling of 13197561 in words is "thirteen million, one hundred ninety-seven thousand, five hundred sixty-one".