831374993 has 2 divisors, whose sum is σ = 831374994. Its totient is φ = 831374992.

The previous prime is 831374969. The next prime is 831375007. The reversal of 831374993 is 399473138.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 709316689 + 122058304 = 26633^2 + 11048^2 .

It is a cyclic number.

It is not a de Polignac number, because 831374993 - 2¹⁰ = 831373969 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (831374923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415687496 + 415687497.

It is an arithmetic number, because the mean of its divisors is an integer number (415687497).

Almost surely, 2^831374993 is an apocalyptic number.

It is an amenable number.

831374993 is a deficient number, since it is larger than the sum of its proper divisors (1).

831374993 is an equidigital number, since it uses as much as digits as its factorization.

831374993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 47.

The square root of 831374993 is about 28833.5740587254. The cubic root of 831374993 is about 940.2983031675.

The spelling of 831374993 in words is "eight hundred thirty-one million, three hundred seventy-four thousand, nine hundred ninety-three".