13623661 has 2 divisors, whose sum is σ = 13623662. Its totient is φ = 13623660.

The previous prime is 13623653. The next prime is 13623667. The reversal of 13623661 is 16632631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11095561 + 2528100 = 3331^2 + 1590^2 .

It is a cyclic number.

It is not a de Polignac number, because 13623661 - 2³ = 13623653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13623667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6811830 + 6811831.

It is an arithmetic number, because the mean of its divisors is an integer number (6811831).

Almost surely, 2^13623661 is an apocalyptic number.

It is an amenable number.

13623661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13623661 is an equidigital number, since it uses as much as digits as its factorization.

13623661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 13623661 is about 3691.0243835553. The cubic root of 13623661 is about 238.8349846848.

The spelling of 13623661 in words is "thirteen million, six hundred twenty-three thousand, six hundred sixty-one".