91828291921 has 2 divisors, whose sum is σ = 91828291922. Its totient is φ = 91828291920.

The previous prime is 91828291901. The next prime is 91828291949. The reversal of 91828291921 is 12919282819.

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., 86107033600 + 5721258321 = 293440^2 + 75639^2 .

It is a cyclic number.

It is not a de Polignac number, because 91828291921 - 2¹¹ = 91828289873 is a prime.

It is not a weakly prime, because it can be changed into another prime (91828291901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45914145960 + 45914145961.

It is an arithmetic number, because the mean of its divisors is an integer number (45914145961).

Almost surely, 2^91828291921 is an apocalyptic number.

It is an amenable number.

91828291921 is a deficient number, since it is larger than the sum of its proper divisors (1).

91828291921 is an equidigital number, since it uses as much as digits as its factorization.

91828291921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 52.

The spelling of 91828291921 in words is "ninety-one billion, eight hundred twenty-eight million, two hundred ninety-one thousand, nine hundred twenty-one".