831520069 has 2 divisors, whose sum is σ = 831520070. Its totient is φ = 831520068.

The previous prime is 831520051. The next prime is 831520087. The reversal of 831520069 is 960025138.

It is a balanced prime because it is at equal distance from previous prime (831520051) and next prime (831520087).

It can be written as a sum of positive squares in only one way, i.e., 579027969 + 252492100 = 24063^2 + 15890^2 .

It is a cyclic number.

It is not a de Polignac number, because 831520069 - 2²⁷ = 697302341 is a prime.

It is a super-2 number, since 2×831520069² = 1382851250299529522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (831560069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415760034 + 415760035.

It is an arithmetic number, because the mean of its divisors is an integer number (415760035).

Almost surely, 2^831520069 is an apocalyptic number.

It is an amenable number.

831520069 is a deficient number, since it is larger than the sum of its proper divisors (1).

831520069 is an equidigital number, since it uses as much as digits as its factorization.

831520069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 831520069 is about 28836.0896967671. The cubic root of 831520069 is about 940.3529944054.

The spelling of 831520069 in words is "eight hundred thirty-one million, five hundred twenty thousand, sixty-nine".