782131117 has 2 divisors, whose sum is σ = 782131118. Its totient is φ = 782131116.

The previous prime is 782131111. The next prime is 782131201. The reversal of 782131117 is 711131287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401842116 + 380289001 = 20046^2 + 19501^2 .

It is a cyclic number.

It is not a de Polignac number, because 782131117 - 2⁷ = 782130989 is a prime.

It is a super-2 number, since 2×782131117² = 1223458168359335378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (782131111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391065558 + 391065559.

It is an arithmetic number, because the mean of its divisors is an integer number (391065559).

Almost surely, 2^782131117 is an apocalyptic number.

It is an amenable number.

782131117 is a deficient number, since it is larger than the sum of its proper divisors (1).

782131117 is an equidigital number, since it uses as much as digits as its factorization.

782131117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 31.

The square root of 782131117 is about 27966.6071771318. The cubic root of 782131117 is about 921.3539912692.

The spelling of 782131117 in words is "seven hundred eighty-two million, one hundred thirty-one thousand, one hundred seventeen".