3991523612351 has 16 divisors (see below), whose sum is σ = 4363585406208. Its totient is φ = 3620996280000.

The previous prime is 3991523612339. The next prime is 3991523612357. The reversal of 3991523612351 is 1532163251993.

It is not a de Polignac number, because 3991523612351 - 2⁶ = 3991523612287 is a prime.

It is a super-2 number, since 2×3991523612351² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3991523612351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991523612357) 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, 49762460 + ... + 49842606.

It is an arithmetic number, because the mean of its divisors is an integer number (272724087888).

Almost surely, 2^{3991523612351} is an apocalyptic number.

3991523612351 is a deficient number, since it is larger than the sum of its proper divisors (372061793857).

3991523612351 is a wasteful number, since it uses less digits than its factorization.

3991523612351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89662.

The product of its digits is 1312200, while the sum is 50.

The spelling of 3991523612351 in words is "three trillion, nine hundred ninety-one billion, five hundred twenty-three million, six hundred twelve thousand, three hundred fifty-one".