991372794 has 16 divisors (see below), whose sum is σ = 1984156032. Its totient is φ = 330222528.

The previous prime is 991372769. The next prime is 991372819. The reversal of 991372794 is 497273199.

It is an interprime number because it is at equal distance from previous prime (991372769) and next prime (991372819).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49519 + ... + 66594.

It is an arithmetic number, because the mean of its divisors is an integer number (124009752).

Almost surely, 2^991372794 is an apocalyptic number.

991372794 is an abundant number, since it is smaller than the sum of its proper divisors (992783238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991372794 is a wasteful number, since it uses less digits than its factorization.

991372794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117541.

The product of its digits is 857304, while the sum is 51.

The square root of 991372794 is about 31486.0730164941. The cubic root of 991372794 is about 997.1159549470.

The spelling of 991372794 in words is "nine hundred ninety-one million, three hundred seventy-two thousand, seven hundred ninety-four".