3131232217 has 2 divisors, whose sum is σ = 3131232218. Its totient is φ = 3131232216.

The previous prime is 3131232211. The next prime is 3131232253. The reversal of 3131232217 is 7122321313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1944016281 + 1187215936 = 44091^2 + 34456^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131232217 - 2¹¹ = 3131230169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3131232191 and 3131232200.

It is not a weakly prime, because it can be changed into another prime (3131232211) 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 as a sum of consecutive naturals, namely, 1565616108 + 1565616109.

It is an arithmetic number, because the mean of its divisors is an integer number (1565616109).

Almost surely, 2^3131232217 is an apocalyptic number.

It is an amenable number.

3131232217 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131232217 is an equidigital number, since it uses as much as digits as its factorization.

3131232217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 3131232217 is about 55957.4143166033. The cubic root of 3131232217 is about 1462.9801230950.

The spelling of 3131232217 in words is "three billion, one hundred thirty-one million, two hundred thirty-two thousand, two hundred seventeen".