15642089 has 2 divisors, whose sum is σ = 15642090. Its totient is φ = 15642088.

The previous prime is 15642061. The next prime is 15642113. The reversal of 15642089 is 98024651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 64 = 3955^2 + 8^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15642089 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15642059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7821044 + 7821045.

It is an arithmetic number, because the mean of its divisors is an integer number (7821045).

Almost surely, 2^15642089 is an apocalyptic number.

It is an amenable number.

15642089 is a deficient number, since it is larger than the sum of its proper divisors (1).

15642089 is an equidigital number, since it uses as much as digits as its factorization.

15642089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 15642089 is about 3955.0080910157. The cubic root of 15642089 is about 250.0911081265.

The spelling of 15642089 in words is "fifteen million, six hundred forty-two thousand, eighty-nine".