991913703 has 16 divisors (see below), whose sum is σ = 1447721856. Its totient is φ = 599102240.

The previous prime is 991913693. The next prime is 991913891. The reversal of 991913703 is 307319199.

It is not a de Polignac number, because 991913703 - 2⁴ = 991913687 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991913903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41625 + ... + 60962.

It is an arithmetic number, because the mean of its divisors is an integer number (90482616).

Almost surely, 2^991913703 is an apocalyptic number.

991913703 is a deficient number, since it is larger than the sum of its proper divisors (455808153).

991913703 is a wasteful number, since it uses less digits than its factorization.

991913703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102894.

The product of its (nonzero) digits is 45927, while the sum is 42.

The square root of 991913703 is about 31494.6615000066. The cubic root of 991913703 is about 997.2972694954.

The spelling of 991913703 in words is "nine hundred ninety-one million, nine hundred thirteen thousand, seven hundred three".