15990361 has 2 divisors, whose sum is σ = 15990362. Its totient is φ = 15990360.

The previous prime is 15990323. The next prime is 15990427. The reversal of 15990361 is 16309951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10017225 + 5973136 = 3165^2 + 2444^2 .

It is a cyclic number.

It is not a de Polignac number, because 15990361 - 2¹⁵ = 15957593 is a prime.

It is not a weakly prime, because it can be changed into another prime (15990301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7995180 + 7995181.

It is an arithmetic number, because the mean of its divisors is an integer number (7995181).

Almost surely, 2^15990361 is an apocalyptic number.

It is an amenable number.

15990361 is a deficient number, since it is larger than the sum of its proper divisors (1).

15990361 is an equidigital number, since it uses as much as digits as its factorization.

15990361 is an odious number, because the sum of its binary digits is odd.

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

The square root of 15990361 is about 3998.7949434798. The cubic root of 15990361 is about 251.9335982350.

The spelling of 15990361 in words is "fifteen million, nine hundred ninety thousand, three hundred sixty-one".