15990613 has 2 divisors, whose sum is σ = 15990614. Its totient is φ = 15990612.

The previous prime is 15990553. The next prime is 15990619. The reversal of 15990613 is 31609951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10640644 + 5349969 = 3262^2 + 2313^2 .

It is a cyclic number.

It is not a de Polignac number, because 15990613 - 2¹⁷ = 15859541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15990619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7995306 + 7995307.

It is an arithmetic number, because the mean of its divisors is an integer number (7995307).

Almost surely, 2^15990613 is an apocalyptic number.

It is an amenable number.

15990613 is a deficient number, since it is larger than the sum of its proper divisors (1).

15990613 is an equidigital number, since it uses as much as digits as its factorization.

15990613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 15990613 is about 3998.8264528484. The cubic root of 15990613 is about 251.9349216767.

The spelling of 15990613 in words is "fifteen million, nine hundred ninety thousand, six hundred thirteen".