3131917 has 2 divisors, whose sum is σ = 3131918. Its totient is φ = 3131916.

The previous prime is 3131911. The next prime is 3131951. The reversal of 3131917 is 7191313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1811716 + 1320201 = 1346^2 + 1149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3131917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3131891 and 3131900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3131911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565958 + 1565959.

It is an arithmetic number, because the mean of its divisors is an integer number (1565959).

Almost surely, 2^3131917 is an apocalyptic number.

It is an amenable number.

3131917 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131917 is an equidigital number, since it uses as much as digits as its factorization.

3131917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567, while the sum is 25.

The square root of 3131917 is about 1769.7222945988. The cubic root of 3131917 is about 146.3086763849.

The spelling of 3131917 in words is "three million, one hundred thirty-one thousand, nine hundred seventeen".