91794581 has 2 divisors, whose sum is σ = 91794582. Its totient is φ = 91794580.

The previous prime is 91794559. The next prime is 91794583. The reversal of 91794581 is 18549719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91508356 + 286225 = 9566^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 91794581 - 2²² = 87600277 is a prime.

It is a super-2 number, since 2×91794581² = 16852490201931122, which contains 22 as substring.

Together with 91794583, 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 (91794583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45897290 + 45897291.

It is an arithmetic number, because the mean of its divisors is an integer number (45897291).

Almost surely, 2^91794581 is an apocalyptic number.

It is an amenable number.

91794581 is a deficient number, since it is larger than the sum of its proper divisors (1).

91794581 is an equidigital number, since it uses as much as digits as its factorization.

91794581 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 91794581 is about 9580.9488569765. The cubic root of 91794581 is about 451.0995023023.

The spelling of 91794581 in words is "ninety-one million, seven hundred ninety-four thousand, five hundred eighty-one".