15920091 has 32 divisors (see below), whose sum is σ = 26000640. Its totient is φ = 9626760.

The previous prime is 15920089. The next prime is 15920123. The reversal of 15920091 is 19002951.

It is a happy number.

It is not a de Polignac number, because 15920091 - 2¹ = 15920089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (15920491) 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 in 31 ways as a sum of consecutive naturals, for example, 35716 + ... + 36158.

It is an arithmetic number, because the mean of its divisors is an integer number (812520).

Almost surely, 2^15920091 is an apocalyptic number.

15920091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15920091 is a deficient number, since it is larger than the sum of its proper divisors (10080549).

15920091 is an equidigital number, since it uses as much as digits as its factorization.

15920091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 15920091 is about 3989.9988721803. The cubic root of 15920091 is about 251.5640137069.

The spelling of 15920091 in words is "fifteen million, nine hundred twenty thousand, ninety-one".