1931321317 has 2 divisors, whose sum is σ = 1931321318. Its totient is φ = 1931321316.

The previous prime is 1931321309. The next prime is 1931321351. The reversal of 1931321317 is 7131231391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1769548356 + 161772961 = 42066^2 + 12719^2 .

It is a cyclic number.

It is not a de Polignac number, because 1931321317 - 2³ = 1931321309 is a prime.

It is a super-2 number, since 2×1931321317² = 7460004058997228978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1931321377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 965660658 + 965660659.

It is an arithmetic number, because the mean of its divisors is an integer number (965660659).

Almost surely, 2^1931321317 is an apocalyptic number.

It is an amenable number.

1931321317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1931321317 is an equidigital number, since it uses as much as digits as its factorization.

1931321317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 31.

The square root of 1931321317 is about 43946.8009871026. The cubic root of 1931321317 is about 1245.3311306657.

The spelling of 1931321317 in words is "one billion, nine hundred thirty-one million, three hundred twenty-one thousand, three hundred seventeen".