13715809 has 2 divisors, whose sum is σ = 13715810. Its totient is φ = 13715808.

The previous prime is 13715803. The next prime is 13715813. The reversal of 13715809 is 90851731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13712209 + 3600 = 3703^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 13715809 - 2¹⁷ = 13584737 is a prime.

It is not a weakly prime, because it can be changed into another prime (13715803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6857904 + 6857905.

It is an arithmetic number, because the mean of its divisors is an integer number (6857905).

Almost surely, 2^13715809 is an apocalyptic number.

It is an amenable number.

13715809 is a deficient number, since it is larger than the sum of its proper divisors (1).

13715809 is an equidigital number, since it uses as much as digits as its factorization.

13715809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 13715809 is about 3703.4860604571. The cubic root of 13715809 is about 239.3722541707.

The spelling of 13715809 in words is "thirteen million, seven hundred fifteen thousand, eight hundred nine".