90244181 has 2 divisors, whose sum is σ = 90244182. Its totient is φ = 90244180.

The previous prime is 90244163. The next prime is 90244303. The reversal of 90244181 is 18144209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58140625 + 32103556 = 7625^2 + 5666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90244181 is a prime.

It is a super-2 number, since 2×90244181² = 16288024408721522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90244081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45122090 + 45122091.

It is an arithmetic number, because the mean of its divisors is an integer number (45122091).

Almost surely, 2^90244181 is an apocalyptic number.

It is an amenable number.

90244181 is a deficient number, since it is larger than the sum of its proper divisors (1).

90244181 is an equidigital number, since it uses as much as digits as its factorization.

90244181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 90244181 is about 9499.6937319053. The cubic root of 90244181 is about 448.5453953033.

The spelling of 90244181 in words is "ninety million, two hundred forty-four thousand, one hundred eighty-one".