811930789 has 2 divisors, whose sum is σ = 811930790. Its totient is φ = 811930788.

The previous prime is 811930739. The next prime is 811930793. The reversal of 811930789 is 987039118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579124225 + 232806564 = 24065^2 + 15258^2 .

It is a cyclic number.

It is not a de Polignac number, because 811930789 - 2⁹ = 811930277 is a prime.

It is a super-2 number, since 2×811930789² = 1318463212252325042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811930739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405965394 + 405965395.

It is an arithmetic number, because the mean of its divisors is an integer number (405965395).

Almost surely, 2^811930789 is an apocalyptic number.

It is an amenable number.

811930789 is a deficient number, since it is larger than the sum of its proper divisors (1).

811930789 is an equidigital number, since it uses as much as digits as its factorization.

811930789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 811930789 is about 28494.3992566960. The cubic root of 811930789 is about 932.9098320002.

The spelling of 811930789 in words is "eight hundred eleven million, nine hundred thirty thousand, seven hundred eighty-nine".