91329005861 has 2 divisors, whose sum is σ = 91329005862. Its totient is φ = 91329005860.

The previous prime is 91329005821. The next prime is 91329005863. The reversal of 91329005861 is 16850092319.

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., 70347483361 + 20981522500 = 265231^2 + 144850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91329005861 is a prime.

Together with 91329005863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91329005863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45664502930 + 45664502931.

It is an arithmetic number, because the mean of its divisors is an integer number (45664502931).

Almost surely, 2^91329005861 is an apocalyptic number.

It is an amenable number.

91329005861 is a deficient number, since it is larger than the sum of its proper divisors (1).

91329005861 is an equidigital number, since it uses as much as digits as its factorization.

91329005861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 91329005861 in words is "ninety-one billion, three hundred twenty-nine million, five thousand, eight hundred sixty-one".