831394261 has 2 divisors, whose sum is σ = 831394262. Its totient is φ = 831394260.

The previous prime is 831394253. The next prime is 831394273. The reversal of 831394261 is 162493138.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 728676036 + 102718225 = 26994^2 + 10135^2 .

It is a cyclic number.

It is not a de Polignac number, because 831394261 - 2³ = 831394253 is a prime.

It is a super-2 number, since 2×831394261² = 1382432834447472242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 831394261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (831394211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415697130 + 415697131.

It is an arithmetic number, because the mean of its divisors is an integer number (415697131).

Almost surely, 2^831394261 is an apocalyptic number.

It is an amenable number.

831394261 is a deficient number, since it is larger than the sum of its proper divisors (1).

831394261 is an equidigital number, since it uses as much as digits as its factorization.

831394261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 831394261 is about 28833.9081811675. The cubic root of 831394261 is about 940.3055672492.

The spelling of 831394261 in words is "eight hundred thirty-one million, three hundred ninety-four thousand, two hundred sixty-one".