3991523612319 has 24 divisors (see below), whose sum is σ = 6106738624272. Its totient is φ = 2503642141440.

The previous prime is 3991523612303. The next prime is 3991523612333. The reversal of 3991523612319 is 9132163251993.

3991523612319 is a `hidden beast` number, since 3 + 9 + 9 + 1 + 5 + 2 + 3 + 612 + 3 + 19 = 666.

It is not a de Polignac number, because 3991523612319 - 2⁴ = 3991523612303 is a prime.

It is a super-2 number, since 2×3991523612319² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991523612339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3935944 + ... + 4845069.

It is an arithmetic number, because the mean of its divisors is an integer number (254447442678).

Almost surely, 2^{3991523612319} is an apocalyptic number.

3991523612319 is a deficient number, since it is larger than the sum of its proper divisors (2115215011953).

3991523612319 is a wasteful number, since it uses less digits than its factorization.

3991523612319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8784007 (or 8784004 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 54.

The spelling of 3991523612319 in words is "three trillion, nine hundred ninety-one billion, five hundred twenty-three million, six hundred twelve thousand, three hundred nineteen".