791818121 has 2 divisors, whose sum is σ = 791818122. Its totient is φ = 791818120.

The previous prime is 791818051. The next prime is 791818169. The reversal of 791818121 is 121818197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 777294400 + 14523721 = 27880^2 + 3811^2 .

It is an emirp because it is prime and its reverse (121818197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 791818121 - 2²⁶ = 724709257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (791818021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395909060 + 395909061.

It is an arithmetic number, because the mean of its divisors is an integer number (395909061).

Almost surely, 2^791818121 is an apocalyptic number.

It is an amenable number.

791818121 is a deficient number, since it is larger than the sum of its proper divisors (1).

791818121 is an equidigital number, since it uses as much as digits as its factorization.

791818121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 38.

The square root of 791818121 is about 28139.2629789765. The cubic root of 791818121 is about 925.1421728389.

The spelling of 791818121 in words is "seven hundred ninety-one million, eight hundred eighteen thousand, one hundred twenty-one".