13815149 has 2 divisors, whose sum is σ = 13815150. Its totient is φ = 13815148.

The previous prime is 13815079. The next prime is 13815161. The reversal of 13815149 is 94151831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13801225 + 13924 = 3715^2 + 118^2 .

It is a cyclic number.

It is not a de Polignac number, because 13815149 - 2⁸ = 13814893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13815449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6907574 + 6907575.

It is an arithmetic number, because the mean of its divisors is an integer number (6907575).

Almost surely, 2^13815149 is an apocalyptic number.

It is an amenable number.

13815149 is a deficient number, since it is larger than the sum of its proper divisors (1).

13815149 is an equidigital number, since it uses as much as digits as its factorization.

13815149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 32.

The square root of 13815149 is about 3716.8735517905. The cubic root of 13815149 is about 239.9487679996.

The spelling of 13815149 in words is "thirteen million, eight hundred fifteen thousand, one hundred forty-nine".