13621697 has 2 divisors, whose sum is σ = 13621698. Its totient is φ = 13621696.

The previous prime is 13621693. The next prime is 13621723. The reversal of 13621697 is 79612631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13256881 + 364816 = 3641^2 + 604^2 .

It is a cyclic number.

It is not a de Polignac number, because 13621697 - 2² = 13621693 is a prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (13621691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6810848 + 6810849.

It is an arithmetic number, because the mean of its divisors is an integer number (6810849).

Almost surely, 2^13621697 is an apocalyptic number.

It is an amenable number.

13621697 is a deficient number, since it is larger than the sum of its proper divisors (1).

13621697 is an equidigital number, since it uses as much as digits as its factorization.

13621697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 13621697 is about 3690.7583231634. The cubic root of 13621697 is about 238.8235072400.

The spelling of 13621697 in words is "thirteen million, six hundred twenty-one thousand, six hundred ninety-seven".