991371716 has 12 divisors (see below), whose sum is σ = 1735718460. Its totient is φ = 495452160.

The previous prime is 991371701. The next prime is 991371739. The reversal of 991371716 is 617173199.

It can be written as a sum of positive squares in 2 ways, for example, as 267976900 + 723394816 = 16370^2 + 26896^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48701 + ... + 65988.

It is an arithmetic number, because the mean of its divisors is an integer number (144643205).

Almost surely, 2^991371716 is an apocalyptic number.

It is an amenable number.

991371716 is a deficient number, since it is larger than the sum of its proper divisors (744346744).

991371716 is a wasteful number, since it uses less digits than its factorization.

991371716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116854 (or 116852 counting only the distinct ones).

The product of its digits is 71442, while the sum is 44.

The square root of 991371716 is about 31486.0558978097. The cubic root of 991371716 is about 997.1155935319.

The spelling of 991371716 in words is "nine hundred ninety-one million, three hundred seventy-one thousand, seven hundred sixteen".