91248281 has 2 divisors, whose sum is σ = 91248282. Its totient is φ = 91248280.

The previous prime is 91248271. The next prime is 91248301. The reversal of 91248281 is 18284219.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46022656 + 45225625 = 6784^2 + 6725^2 .

It is an emirp because it is prime and its reverse (18284219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91248281 - 2⁶ = 91248217 is a prime.

It is a super-2 number, since 2×91248281² = 16652497570909922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91248271) 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, 45624140 + 45624141.

It is an arithmetic number, because the mean of its divisors is an integer number (45624141).

Almost surely, 2^91248281 is an apocalyptic number.

It is an amenable number.

91248281 is a deficient number, since it is larger than the sum of its proper divisors (1).

91248281 is an equidigital number, since it uses as much as digits as its factorization.

91248281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 35.

The square root of 91248281 is about 9552.3966102754. The cubic root of 91248281 is about 450.2028402420.

The spelling of 91248281 in words is "ninety-one million, two hundred forty-eight thousand, two hundred eighty-one".