13697561 has 2 divisors, whose sum is σ = 13697562. Its totient is φ = 13697560.

The previous prime is 13697557. The next prime is 13697587. The reversal of 13697561 is 16579631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 118336 = 3685^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 13697561 - 2² = 13697557 is a prime.

It is not a weakly prime, because it can be changed into another prime (13697531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6848780 + 6848781.

It is an arithmetic number, because the mean of its divisors is an integer number (6848781).

Almost surely, 2^13697561 is an apocalyptic number.

It is an amenable number.

13697561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13697561 is an equidigital number, since it uses as much as digits as its factorization.

13697561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 38.

The square root of 13697561 is about 3701.0216157164. The cubic root of 13697561 is about 239.2660506049.

The spelling of 13697561 in words is "thirteen million, six hundred ninety-seven thousand, five hundred sixty-one".