92145721 has 2 divisors, whose sum is σ = 92145722. Its totient is φ = 92145720.

The previous prime is 92145643. The next prime is 92145761. The reversal of 92145721 is 12754129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60279696 + 31866025 = 7764^2 + 5645^2 .

It is an emirp because it is prime and its reverse (12754129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 92145721 - 2²⁵ = 58591289 is a prime.

It is not a weakly prime, because it can be changed into another prime (92145761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46072860 + 46072861.

It is an arithmetic number, because the mean of its divisors is an integer number (46072861).

Almost surely, 2^92145721 is an apocalyptic number.

It is an amenable number.

92145721 is a deficient number, since it is larger than the sum of its proper divisors (1).

92145721 is an equidigital number, since it uses as much as digits as its factorization.

92145721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 92145721 is about 9599.2562732745. The cubic root of 92145721 is about 451.6739644402.

The spelling of 92145721 in words is "ninety-two million, one hundred forty-five thousand, seven hundred twenty-one".