91850281 has 2 divisors, whose sum is σ = 91850282. Its totient is φ = 91850280.

The previous prime is 91850261. The next prime is 91850287. The reversal of 91850281 is 18205819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79495056 + 12355225 = 8916^2 + 3515^2 .

It is a cyclic number.

It is not a de Polignac number, because 91850281 - 2⁵ = 91850249 is a prime.

It is a super-2 number, since 2×91850281² = 16872948239557922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91850287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45925140 + 45925141.

It is an arithmetic number, because the mean of its divisors is an integer number (45925141).

Almost surely, 2^91850281 is an apocalyptic number.

It is an amenable number.

91850281 is a deficient number, since it is larger than the sum of its proper divisors (1).

91850281 is an equidigital number, since it uses as much as digits as its factorization.

91850281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 91850281 is about 9583.8552263690. The cubic root of 91850281 is about 451.1907246875.

The spelling of 91850281 in words is "ninety-one million, eight hundred fifty thousand, two hundred eighty-one".