15642013 has 2 divisors, whose sum is σ = 15642014. Its totient is φ = 15642012.

The previous prime is 15641987. The next prime is 15642031. The reversal of 15642013 is 31024651.

Together with next prime (15642031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9078169 + 6563844 = 3013^2 + 2562^2 .

It is a cyclic number.

It is not a de Polignac number, because 15642013 - 2⁹ = 15641501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15642043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7821006 + 7821007.

It is an arithmetic number, because the mean of its divisors is an integer number (7821007).

Almost surely, 2^15642013 is an apocalyptic number.

It is an amenable number.

15642013 is a deficient number, since it is larger than the sum of its proper divisors (1).

15642013 is an equidigital number, since it uses as much as digits as its factorization.

15642013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 15642013 is about 3954.9984829327. The cubic root of 15642013 is about 250.0907030878.

Adding to 15642013 its reverse (31024651), we get a palindrome (46666664).

The spelling of 15642013 in words is "fifteen million, six hundred forty-two thousand, thirteen".