90019289 has 2 divisors, whose sum is σ = 90019290. Its totient is φ = 90019288.

The previous prime is 90019273. The next prime is 90019297. The reversal of 90019289 is 98291009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52809289 + 37210000 = 7267^2 + 6100^2 .

It is a cyclic number.

It is not a de Polignac number, because 90019289 - 2⁴ = 90019273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90019249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45009644 + 45009645.

It is an arithmetic number, because the mean of its divisors is an integer number (45009645).

Almost surely, 2^90019289 is an apocalyptic number.

It is an amenable number.

90019289 is a deficient number, since it is larger than the sum of its proper divisors (1).

90019289 is an equidigital number, since it uses as much as digits as its factorization.

90019289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 90019289 is about 9487.8495456030. The cubic root of 90019289 is about 448.1724878562.

The spelling of 90019289 in words is "ninety million, nineteen thousand, two hundred eighty-nine".