831400109 has 2 divisors, whose sum is σ = 831400110. Its totient is φ = 831400108.

The previous prime is 831400051. The next prime is 831400121. The reversal of 831400109 is 901004138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434514025 + 396886084 = 20845^2 + 19922^2 .

It is a cyclic number.

It is not a de Polignac number, because 831400109 - 2²⁸ = 562964653 is a prime.

It is a super-2 number, since 2×831400109² = 1382452282490423762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (831400909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415700054 + 415700055.

It is an arithmetic number, because the mean of its divisors is an integer number (415700055).

Almost surely, 2^831400109 is an apocalyptic number.

It is an amenable number.

831400109 is a deficient number, since it is larger than the sum of its proper divisors (1).

831400109 is an equidigital number, since it uses as much as digits as its factorization.

831400109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 831400109 is about 28834.0095893721. The cubic root of 831400109 is about 940.3077719369.

The spelling of 831400109 in words is "eight hundred thirty-one million, four hundred thousand, one hundred nine".