3991529228361 has 16 divisors (see below), whose sum is σ = 5505732384960. Its totient is φ = 2569178606400.

The previous prime is 3991529228299. The next prime is 3991529228387. The reversal of 3991529228361 is 1638229251993.

It is not a de Polignac number, because 3991529228361 - 2¹⁰ = 3991529227337 is a prime.

It is a super-4 number, since 4×3991529228361⁴ (a number of 52 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3991529228295 and 3991529228304.

It is not an unprimeable number, because it can be changed into a prime (3991529228761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2089311 + ... + 3514011.

It is an arithmetic number, because the mean of its divisors is an integer number (344108274060).

Almost surely, 2^{3991529228361} is an apocalyptic number.

It is an amenable number.

3991529228361 is a deficient number, since it is larger than the sum of its proper divisors (1514203156599).

3991529228361 is a wasteful number, since it uses less digits than its factorization.

3991529228361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456936.

The product of its digits is 12597120, while the sum is 60.

The spelling of 3991529228361 in words is "three trillion, nine hundred ninety-one billion, five hundred twenty-nine million, two hundred twenty-eight thousand, three hundred sixty-one".