15991085 has 16 divisors (see below), whose sum is σ = 21071232. Its totient is φ = 11553600.

The previous prime is 15991037. The next prime is 15991097. The reversal of 15991085 is 58019951.

It is not a de Polignac number, because 15991085 - 2⁶ = 15991021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8315 + ... + 10055.

It is an arithmetic number, because the mean of its divisors is an integer number (1316952).

Almost surely, 2^15991085 is an apocalyptic number.

It is an amenable number.

15991085 is a deficient number, since it is larger than the sum of its proper divisors (5080147).

15991085 is a wasteful number, since it uses less digits than its factorization.

15991085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 15991085 is about 3998.8854697278. The cubic root of 15991085 is about 251.9374004667.

The spelling of 15991085 in words is "fifteen million, nine hundred ninety-one thousand, eighty-five".