831187493 has 2 divisors, whose sum is σ = 831187494. Its totient is φ = 831187492.

The previous prime is 831187459. The next prime is 831187507. The reversal of 831187493 is 394781138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 733434724 + 97752769 = 27082^2 + 9887^2 .

It is a cyclic number.

It is not a de Polignac number, because 831187493 - 2⁶ = 831187429 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (831189493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415593746 + 415593747.

It is an arithmetic number, because the mean of its divisors is an integer number (415593747).

Almost surely, 2^831187493 is an apocalyptic number.

It is an amenable number.

831187493 is a deficient number, since it is larger than the sum of its proper divisors (1).

831187493 is an equidigital number, since it uses as much as digits as its factorization.

831187493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 831187493 is about 28830.3224574405. The cubic root of 831187493 is about 940.2276093614.

The spelling of 831187493 in words is "eight hundred thirty-one million, one hundred eighty-seven thousand, four hundred ninety-three".