1931317 has 2 divisors, whose sum is σ = 1931318. Its totient is φ = 1931316.

The previous prime is 1931309. The next prime is 1931323. The reversal of 1931317 is 7131391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1572516 + 358801 = 1254^2 + 599^2 .

It is a cyclic number.

It is not a de Polignac number, because 1931317 - 2³ = 1931309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1931291 and 1931300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1931357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965658 + 965659.

It is an arithmetic number, because the mean of its divisors is an integer number (965659).

2^1931317 is an apocalyptic number.

It is an amenable number.

1931317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1931317 is an equidigital number, since it uses as much as digits as its factorization.

1931317 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 1931317 is about 1389.7183167822. The cubic root of 1931317 is about 124.5330202787.

The spelling of 1931317 in words is "one million, nine hundred thirty-one thousand, three hundred seventeen".