3931632021 has 4 divisors (see below), whose sum is σ = 5242176032. Its totient is φ = 2621088012.

The previous prime is 3931632011. The next prime is 3931632043. The reversal of 3931632021 is 1202361393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3931632021 - 2¹⁷ = 3931500949 is a prime.

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 3931632021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931632011) 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 3 ways as a sum of consecutive naturals, for example, 655272001 + ... + 655272006.

It is an arithmetic number, because the mean of its divisors is an integer number (1310544008).

Almost surely, 2^3931632021 is an apocalyptic number.

It is an amenable number.

3931632021 is a deficient number, since it is larger than the sum of its proper divisors (1310544011).

3931632021 is a wasteful number, since it uses less digits than its factorization.

3931632021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310544010.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 3931632021 is about 62702.7273808724. The cubic root of 3931632021 is about 1578.3050805192.

The spelling of 3931632021 in words is "three billion, nine hundred thirty-one million, six hundred thirty-two thousand, twenty-one".