3131143021 has 8 divisors (see below), whose sum is σ = 3240397080. Its totient is φ = 3021974592.

The previous prime is 3131142991. The next prime is 3131143031. The reversal of 3131143021 is 1203411313.

It can be written as a sum of positive squares in 4 ways, for example, as 25867396 + 3105275625 = 5086^2 + 55725^2 .

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 3131143021 - 2⁷ = 3131142893 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 3131143021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131143031) 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, 58051 + ... + 98143.

It is an arithmetic number, because the mean of its divisors is an integer number (405049635).

Almost surely, 2^3131143021 is an apocalyptic number.

It is an amenable number.

3131143021 is a deficient number, since it is larger than the sum of its proper divisors (109254059).

3131143021 is a wasteful number, since it uses less digits than its factorization.

3131143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42815.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 3131143021 is about 55956.6173119855. The cubic root of 3131143021 is about 1462.9662315229.

Adding to 3131143021 its reverse (1203411313), we get a palindrome (4334554334).

The spelling of 3131143021 in words is "three billion, one hundred thirty-one million, one hundred forty-three thousand, twenty-one".