3643121631 has 8 divisors (see below), whose sum is σ = 4858689024. Its totient is φ = 2428151000.

The previous prime is 3643121627. The next prime is 3643121633. The reversal of 3643121631 is 1361213463.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3643121631 - 2² = 3643121627 is a prime.

It is a super-2 number, since 2×3643121631² = 26544670436520200322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643121633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134745 + ... + 159506.

It is an arithmetic number, because the mean of its divisors is an integer number (607336128).

Almost surely, 2^3643121631 is an apocalyptic number.

3643121631 is a deficient number, since it is larger than the sum of its proper divisors (1215567393).

3643121631 is a wasteful number, since it uses less digits than its factorization.

3643121631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298381.

The product of its digits is 7776, while the sum is 30.

The square root of 3643121631 is about 60358.2772368463. The cubic root of 3643121631 is about 1538.7139472596.

The spelling of 3643121631 in words is "three billion, six hundred forty-three million, one hundred twenty-one thousand, six hundred thirty-one".