91505761 has 2 divisors, whose sum is σ = 91505762. Its totient is φ = 91505760.

The previous prime is 91505741. The next prime is 91505783. The reversal of 91505761 is 16750519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85673536 + 5832225 = 9256^2 + 2415^2 .

It is a cyclic number.

It is not a de Polignac number, because 91505761 - 2⁷ = 91505633 is a prime.

It is not a weakly prime, because it can be changed into another prime (91505741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45752880 + 45752881.

It is an arithmetic number, because the mean of its divisors is an integer number (45752881).

Almost surely, 2^91505761 is an apocalyptic number.

It is an amenable number.

91505761 is a deficient number, since it is larger than the sum of its proper divisors (1).

91505761 is an equidigital number, since it uses as much as digits as its factorization.

91505761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 91505761 is about 9565.8643624087. The cubic root of 91505761 is about 450.6258961280.

The spelling of 91505761 in words is "ninety-one million, five hundred five thousand, seven hundred sixty-one".