91333861 has 2 divisors, whose sum is σ = 91333862. Its totient is φ = 91333860.

The previous prime is 91333841. The next prime is 91333883. The reversal of 91333861 is 16833319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90611361 + 722500 = 9519^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 91333861 - 2⁷ = 91333733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91333811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45666930 + 45666931.

It is an arithmetic number, because the mean of its divisors is an integer number (45666931).

Almost surely, 2^91333861 is an apocalyptic number.

It is an amenable number.

91333861 is a deficient number, since it is larger than the sum of its proper divisors (1).

91333861 is an equidigital number, since it uses as much as digits as its factorization.

91333861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 91333861 is about 9556.8750645805. The cubic root of 91333861 is about 450.3435417797.

The spelling of 91333861 in words is "ninety-one million, three hundred thirty-three thousand, eight hundred sixty-one".