15601409 has 2 divisors, whose sum is σ = 15601410. Its totient is φ = 15601408.

The previous prime is 15601387. The next prime is 15601477. The reversal of 15601409 is 90410651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15429184 + 172225 = 3928^2 + 415^2 .

It is an emirp because it is prime and its reverse (90410651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15601409 - 2¹⁶ = 15535873 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15601009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7800704 + 7800705.

It is an arithmetic number, because the mean of its divisors is an integer number (7800705).

Almost surely, 2^15601409 is an apocalyptic number.

It is an amenable number.

15601409 is a deficient number, since it is larger than the sum of its proper divisors (1).

15601409 is an equidigital number, since it uses as much as digits as its factorization.

15601409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 15601409 is about 3949.8618963199. The cubic root of 15601409 is about 249.8741179588.

The spelling of 15601409 in words is "fifteen million, six hundred one thousand, four hundred nine".