91648237 has 2 divisors, whose sum is σ = 91648238. Its totient is φ = 91648236.

The previous prime is 91648211. The next prime is 91648301. The reversal of 91648237 is 73284619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86657481 + 4990756 = 9309^2 + 2234^2 .

It is an emirp because it is prime and its reverse (73284619) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91648237 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91648237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91648937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45824118 + 45824119.

It is an arithmetic number, because the mean of its divisors is an integer number (45824119).

Almost surely, 2^91648237 is an apocalyptic number.

It is an amenable number.

91648237 is a deficient number, since it is larger than the sum of its proper divisors (1).

91648237 is an equidigital number, since it uses as much as digits as its factorization.

91648237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 91648237 is about 9573.3085712307. The cubic root of 91648237 is about 450.8596522011.

The spelling of 91648237 in words is "ninety-one million, six hundred forty-eight thousand, two hundred thirty-seven".