991580315 has 16 divisors (see below), whose sum is σ = 1319353056. Its totient is φ = 709324800.

The previous prime is 991580287. The next prime is 991580321. The reversal of 991580315 is 513085199.

991580315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 991580315 - 2⁶ = 991580251 is a prime.

It is a Duffinian 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, 144422 + ... + 151131.

It is an arithmetic number, because the mean of its divisors is an integer number (82459566).

Almost surely, 2^991580315 is an apocalyptic number.

991580315 is a deficient number, since it is larger than the sum of its proper divisors (327772741).

991580315 is a wasteful number, since it uses less digits than its factorization.

991580315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295630.

The product of its (nonzero) digits is 48600, while the sum is 41.

The square root of 991580315 is about 31489.3682851848. The cubic root of 991580315 is about 997.1855244924.

The spelling of 991580315 in words is "nine hundred ninety-one million, five hundred eighty thousand, three hundred fifteen".