15942109 has 2 divisors, whose sum is σ = 15942110. Its totient is φ = 15942108.

The previous prime is 15942103. The next prime is 15942119. The reversal of 15942109 is 90124951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 4853209 = 3330^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 15942109 - 2⁵ = 15942077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15942103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7971054 + 7971055.

It is an arithmetic number, because the mean of its divisors is an integer number (7971055).

Almost surely, 2^15942109 is an apocalyptic number.

It is an amenable number.

15942109 is a deficient number, since it is larger than the sum of its proper divisors (1).

15942109 is an equidigital number, since it uses as much as digits as its factorization.

15942109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 15942109 is about 3992.7570674911. The cubic root of 15942109 is about 251.6799340013.

The spelling of 15942109 in words is "fifteen million, nine hundred forty-two thousand, one hundred nine".