91244261 has 2 divisors, whose sum is σ = 91244262. Its totient is φ = 91244260.

The previous prime is 91244221. The next prime is 91244269. The reversal of 91244261 is 16244219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74063236 + 17181025 = 8606^2 + 4145^2 .

It is an emirp because it is prime and its reverse (16244219) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91244261 is a prime.

It is a super-2 number, since 2×91244261² = 16651030330872242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91244269) 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, 45622130 + 45622131.

It is an arithmetic number, because the mean of its divisors is an integer number (45622131).

Almost surely, 2^91244261 is an apocalyptic number.

It is an amenable number.

91244261 is a deficient number, since it is larger than the sum of its proper divisors (1).

91244261 is an equidigital number, since it uses as much as digits as its factorization.

91244261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 91244261 is about 9552.1861895589. The cubic root of 91244261 is about 450.1962288225.

The spelling of 91244261 in words is "ninety-one million, two hundred forty-four thousand, two hundred sixty-one".