991310739 has 16 divisors (see below), whose sum is σ = 1330656000. Its totient is φ = 656431776.

The previous prime is 991310737. The next prime is 991310753. The reversal of 991310739 is 937013199.

It is not a de Polignac number, because 991310739 - 2¹ = 991310737 is a prime.

It is a super-2 number, since 2×991310739² = 1965393962513452242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 991310739.

It is not an unprimeable number, because it can be changed into a prime (991310737) 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, 493912 + ... + 495914.

It is an arithmetic number, because the mean of its divisors is an integer number (83166000).

Almost surely, 2^991310739 is an apocalyptic number.

991310739 is a deficient number, since it is larger than the sum of its proper divisors (339345261).

991310739 is a wasteful number, since it uses less digits than its factorization.

991310739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034.

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

The square root of 991310739 is about 31485.0875653856. The cubic root of 991310739 is about 997.0951496818.

The spelling of 991310739 in words is "nine hundred ninety-one million, three hundred ten thousand, seven hundred thirty-nine".