15613139 has 2 divisors, whose sum is σ = 15613140. Its totient is φ = 15613138.

The previous prime is 15613109. The next prime is 15613141. The reversal of 15613139 is 93131651.

It is a strong prime.

It is an emirp because it is prime and its reverse (93131651) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15613139 is a prime.

Together with 15613141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15613109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7806569 + 7806570.

It is an arithmetic number, because the mean of its divisors is an integer number (7806570).

Almost surely, 2^15613139 is an apocalyptic number.

15613139 is a deficient number, since it is larger than the sum of its proper divisors (1).

15613139 is an equidigital number, since it uses as much as digits as its factorization.

15613139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 29.

The square root of 15613139 is about 3951.3464793662. The cubic root of 15613139 is about 249.9367253199.

The spelling of 15613139 in words is "fifteen million, six hundred thirteen thousand, one hundred thirty-nine".