13623509 has 2 divisors, whose sum is σ = 13623510. Its totient is φ = 13623508.

The previous prime is 13623503. The next prime is 13623523. The reversal of 13623509 is 90532631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7263025 + 6360484 = 2695^2 + 2522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13623509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13623503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6811754 + 6811755.

It is an arithmetic number, because the mean of its divisors is an integer number (6811755).

Almost surely, 2^13623509 is an apocalyptic number.

It is an amenable number.

13623509 is a deficient number, since it is larger than the sum of its proper divisors (1).

13623509 is an equidigital number, since it uses as much as digits as its factorization.

13623509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 13623509 is about 3691.0037930081. The cubic root of 13623509 is about 238.8340964494.

The spelling of 13623509 in words is "thirteen million, six hundred twenty-three thousand, five hundred nine".