13621109 has 2 divisors, whose sum is σ = 13621110. Its totient is φ = 13621108.

The previous prime is 13621099. The next prime is 13621123. The reversal of 13621109 is 90112631.

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., 12802084 + 819025 = 3578^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 13621109 - 2²⁰ = 12572533 is a prime.

It is a super-2 number, since 2×13621109² = 371069220779762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13621189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6810554 + 6810555.

It is an arithmetic number, because the mean of its divisors is an integer number (6810555).

Almost surely, 2^13621109 is an apocalyptic number.

It is an amenable number.

13621109 is a deficient number, since it is larger than the sum of its proper divisors (1).

13621109 is an equidigital number, since it uses as much as digits as its factorization.

13621109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 13621109 is about 3690.6786638774. The cubic root of 13621109 is about 238.8200708047.

The spelling of 13621109 in words is "thirteen million, six hundred twenty-one thousand, one hundred nine".