91759841 has 2 divisors, whose sum is σ = 91759842. Its totient is φ = 91759840.

The previous prime is 91759823. The next prime is 91759849. The reversal of 91759841 is 14895719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 28398241 = 7960^2 + 5329^2 .

It is a cyclic number.

It is not a de Polignac number, because 91759841 - 2⁶ = 91759777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 91759792 and 91759801.

It is not a weakly prime, because it can be changed into another prime (91759849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45879920 + 45879921.

It is an arithmetic number, because the mean of its divisors is an integer number (45879921).

Almost surely, 2^91759841 is an apocalyptic number.

It is an amenable number.

91759841 is a deficient number, since it is larger than the sum of its proper divisors (1).

91759841 is an equidigital number, since it uses as much as digits as its factorization.

91759841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 91759841 is about 9579.1357125787. The cubic root of 91759841 is about 451.0425883614.

The spelling of 91759841 in words is "ninety-one million, seven hundred fifty-nine thousand, eight hundred forty-one".