13620641 has 2 divisors, whose sum is σ = 13620642. Its totient is φ = 13620640.

The previous prime is 13620619. The next prime is 13620667. The reversal of 13620641 is 14602631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13476241 + 144400 = 3671^2 + 380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13620641 is a prime.

It is a super-2 number, since 2×13620641² = 371043722501762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13620601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6810320 + 6810321.

It is an arithmetic number, because the mean of its divisors is an integer number (6810321).

Almost surely, 2^13620641 is an apocalyptic number.

It is an amenable number.

13620641 is a deficient number, since it is larger than the sum of its proper divisors (1).

13620641 is an equidigital number, since it uses as much as digits as its factorization.

13620641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 13620641 is about 3690.6152603597. The cubic root of 13620641 is about 238.8173356120.

The spelling of 13620641 in words is "thirteen million, six hundred twenty thousand, six hundred forty-one".