92091721 has 2 divisors, whose sum is σ = 92091722. Its totient is φ = 92091720.

The previous prime is 92091709. The next prime is 92091751. The reversal of 92091721 is 12719029.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80802121 + 11289600 = 8989^2 + 3360^2 .

It is an emirp because it is prime and its reverse (12719029) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 92091721 - 2¹³ = 92083529 is a prime.

It is not a weakly prime, because it can be changed into another prime (92091751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46045860 + 46045861.

It is an arithmetic number, because the mean of its divisors is an integer number (46045861).

Almost surely, 2^92091721 is an apocalyptic number.

It is an amenable number.

92091721 is a deficient number, since it is larger than the sum of its proper divisors (1).

92091721 is an equidigital number, since it uses as much as digits as its factorization.

92091721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 92091721 is about 9596.4431431651. The cubic root of 92091721 is about 451.5857159578.

The spelling of 92091721 in words is "ninety-two million, ninety-one thousand, seven hundred twenty-one".