15940609 has 2 divisors, whose sum is σ = 15940610. Its totient is φ = 15940608.

The previous prime is 15940597. The next prime is 15940637. The reversal of 15940609 is 90604951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9284209 + 6656400 = 3047^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 15940609 - 2⁷ = 15940481 is a prime.

It is not a weakly prime, because it can be changed into another prime (15940009) 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, 7970304 + 7970305.

It is an arithmetic number, because the mean of its divisors is an integer number (7970305).

Almost surely, 2^15940609 is an apocalyptic number.

It is an amenable number.

15940609 is a deficient number, since it is larger than the sum of its proper divisors (1).

15940609 is an equidigital number, since it uses as much as digits as its factorization.

15940609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 15940609 is about 3992.5692229440. The cubic root of 15940609 is about 251.6720401954.

The spelling of 15940609 in words is "fifteen million, nine hundred forty thousand, six hundred nine".