831530641 has 2 divisors, whose sum is σ = 831530642. Its totient is φ = 831530640.

The previous prime is 831530551. The next prime is 831530671. The reversal of 831530641 is 146035138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 591900241 + 239630400 = 24329^2 + 15480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-831530641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (831530671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415765320 + 415765321.

It is an arithmetic number, because the mean of its divisors is an integer number (415765321).

Almost surely, 2^831530641 is an apocalyptic number.

It is an amenable number.

831530641 is a deficient number, since it is larger than the sum of its proper divisors (1).

831530641 is an equidigital number, since it uses as much as digits as its factorization.

831530641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 831530641 is about 28836.2730081403. The cubic root of 831530641 is about 940.3569796248.

Adding to 831530641 its reverse (146035138), we get a palindrome (977565779).

The spelling of 831530641 in words is "eight hundred thirty-one million, five hundred thirty thousand, six hundred forty-one".