3121631 has 8 divisors (see below), whose sum is σ = 3204240. Its totient is φ = 3040128.

The previous prime is 3121627. The next prime is 3121633. The reversal of 3121631 is 1361213.

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 3121631 - 2² = 3121627 is a prime.

It is a super-2 number, since 2×3121631² = 19489160200322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121633) 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, 9095 + ... + 9431.

It is an arithmetic number, because the mean of its divisors is an integer number (400530).

Almost surely, 2^3121631 is an apocalyptic number.

3121631 is a deficient number, since it is larger than the sum of its proper divisors (82609).

3121631 is a wasteful number, since it uses less digits than its factorization.

3121631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553.

The product of its digits is 108, while the sum is 17.

The square root of 3121631 is about 1766.8137989047. The cubic root of 3121631 is about 146.1483292683.

Adding to 3121631 its reverse (1361213), we get a palindrome (4482844).

The spelling of 3121631 in words is "three million, one hundred twenty-one thousand, six hundred thirty-one".