90244991 has 2 divisors, whose sum is σ = 90244992. Its totient is φ = 90244990.

The previous prime is 90244981. The next prime is 90245039. The reversal of 90244991 is 19944209.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90244991 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90244901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45122495 + 45122496.

It is an arithmetic number, because the mean of its divisors is an integer number (45122496).

Almost surely, 2^90244991 is an apocalyptic number.

90244991 is a deficient number, since it is larger than the sum of its proper divisors (1).

90244991 is an equidigital number, since it uses as much as digits as its factorization.

90244991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 90244991 is about 9499.7363647630. The cubic root of 90244991 is about 448.5467372945.

The spelling of 90244991 in words is "ninety million, two hundred forty-four thousand, nine hundred ninety-one".