991348685 has 16 divisors (see below), whose sum is σ = 1197918720. Its totient is φ = 787563840.

The previous prime is 991348681. The next prime is 991348697. The reversal of 991348685 is 586843199.

It is not a de Polignac number, because 991348685 - 2² = 991348681 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991348681) 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, 688196 + ... + 689634.

It is an arithmetic number, because the mean of its divisors is an integer number (74869920).

Almost surely, 2^991348685 is an apocalyptic number.

It is an amenable number.

991348685 is a deficient number, since it is larger than the sum of its proper divisors (206570035).

991348685 is a wasteful number, since it uses less digits than its factorization.

991348685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308.

The product of its digits is 1866240, while the sum is 53.

The square root of 991348685 is about 31485.6901623579. The cubic root of 991348685 is about 997.1078719926.

The spelling of 991348685 in words is "nine hundred ninety-one million, three hundred forty-eight thousand, six hundred eighty-five".