15139391 has 2 divisors, whose sum is σ = 15139392. Its totient is φ = 15139390.

The previous prime is 15139381. The next prime is 15139393. The reversal of 15139391 is 19393151.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19393151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15139391 - 2²² = 10945087 is a prime.

Together with 15139393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15139393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7569695 + 7569696.

It is an arithmetic number, because the mean of its divisors is an integer number (7569696).

Almost surely, 2^15139391 is an apocalyptic number.

15139391 is a deficient number, since it is larger than the sum of its proper divisors (1).

15139391 is an equidigital number, since it uses as much as digits as its factorization.

15139391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3645, while the sum is 32.

The square root of 15139391 is about 3890.9370336720. The cubic root of 15139391 is about 247.3827816185.

The spelling of 15139391 in words is "fifteen million, one hundred thirty-nine thousand, three hundred ninety-one".