791130221989 has 2 divisors, whose sum is σ = 791130221990. Its totient is φ = 791130221988.

The previous prime is 791130221969. The next prime is 791130222017. The reversal of 791130221989 is 989122031197.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 791130197025 + 24964 = 889455^2 + 158^2 .

It is a cyclic number.

It is not a de Polignac number, because 791130221989 - 2¹¹ = 791130219941 is a prime.

It is a super-2 number, since 2×791130221989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (791130221939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395565110994 + 395565110995.

It is an arithmetic number, because the mean of its divisors is an integer number (395565110995).

Almost surely, 2^791130221989 is an apocalyptic number.

It is an amenable number.

791130221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

791130221989 is an equidigital number, since it uses as much as digits as its factorization.

791130221989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 52.

The spelling of 791130221989 in words is "seven hundred ninety-one billion, one hundred thirty million, two hundred twenty-one thousand, nine hundred eighty-nine".