90661237 has 2 divisors, whose sum is σ = 90661238. Its totient is φ = 90661236.

The previous prime is 90661213. The next prime is 90661247. The reversal of 90661237 is 73216609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69372241 + 21288996 = 8329^2 + 4614^2 .

It is an emirp because it is prime and its reverse (73216609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90661237 - 2¹¹ = 90659189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90661247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45330618 + 45330619.

It is an arithmetic number, because the mean of its divisors is an integer number (45330619).

Almost surely, 2^90661237 is an apocalyptic number.

It is an amenable number.

90661237 is a deficient number, since it is larger than the sum of its proper divisors (1).

90661237 is an equidigital number, since it uses as much as digits as its factorization.

90661237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 90661237 is about 9521.6194525931. The cubic root of 90661237 is about 449.2353053894.

The spelling of 90661237 in words is "ninety million, six hundred sixty-one thousand, two hundred thirty-seven".