91329005309 has 2 divisors, whose sum is σ = 91329005310. Its totient is φ = 91329005308.

The previous prime is 91329005197. The next prime is 91329005321. The reversal of 91329005309 is 90350092319.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77545540900 + 13783464409 = 278470^2 + 117403^2 .

It is a cyclic number.

It is not a de Polignac number, because 91329005309 - 2¹⁶ = 91328939773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91329002309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45664502654 + 45664502655.

It is an arithmetic number, because the mean of its divisors is an integer number (45664502655).

Almost surely, 2^91329005309 is an apocalyptic number.

It is an amenable number.

91329005309 is a deficient number, since it is larger than the sum of its proper divisors (1).

91329005309 is an equidigital number, since it uses as much as digits as its factorization.

91329005309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610, while the sum is 41.

The spelling of 91329005309 in words is "ninety-one billion, three hundred twenty-nine million, five thousand, three hundred nine".