90388841 has 2 divisors, whose sum is σ = 90388842. Its totient is φ = 90388840.

The previous prime is 90388799. The next prime is 90388843. The reversal of 90388841 is 14888309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57441241 + 32947600 = 7579^2 + 5740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90388841 is a prime.

Together with 90388843, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90388843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45194420 + 45194421.

It is an arithmetic number, because the mean of its divisors is an integer number (45194421).

Almost surely, 2^90388841 is an apocalyptic number.

It is an amenable number.

90388841 is a deficient number, since it is larger than the sum of its proper divisors (1).

90388841 is an equidigital number, since it uses as much as digits as its factorization.

90388841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 90388841 is about 9507.3046127701. The cubic root of 90388841 is about 448.7849377546.

The spelling of 90388841 in words is "ninety million, three hundred eighty-eight thousand, eight hundred forty-one".