15615791 has 2 divisors, whose sum is σ = 15615792. Its totient is φ = 15615790.

The previous prime is 15615779. The next prime is 15615839. The reversal of 15615791 is 19751651.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19751651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15615791 - 2¹⁴ = 15599407 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15615191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7807895 + 7807896.

It is an arithmetic number, because the mean of its divisors is an integer number (7807896).

Almost surely, 2^15615791 is an apocalyptic number.

15615791 is a deficient number, since it is larger than the sum of its proper divisors (1).

15615791 is an equidigital number, since it uses as much as digits as its factorization.

15615791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 35.

The square root of 15615791 is about 3951.6820469263. The cubic root of 15615791 is about 249.9508756812.

The spelling of 15615791 in words is "fifteen million, six hundred fifteen thousand, seven hundred ninety-one".