15891013 has 2 divisors, whose sum is σ = 15891014. Its totient is φ = 15891012.

The previous prime is 15890989. The next prime is 15891047. The reversal of 15891013 is 31019851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15539364 + 351649 = 3942^2 + 593^2 .

It is a cyclic number.

It is not a de Polignac number, because 15891013 - 2⁵ = 15890981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15891613) 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, 7945506 + 7945507.

It is an arithmetic number, because the mean of its divisors is an integer number (7945507).

Almost surely, 2^15891013 is an apocalyptic number.

It is an amenable number.

15891013 is a deficient number, since it is larger than the sum of its proper divisors (1).

15891013 is an equidigital number, since it uses as much as digits as its factorization.

15891013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 15891013 is about 3986.3533461047. The cubic root of 15891013 is about 251.4107600496.

The spelling of 15891013 in words is "fifteen million, eight hundred ninety-one thousand, thirteen".