90333989 has 2 divisors, whose sum is σ = 90333990. Its totient is φ = 90333988.

The previous prime is 90333977. The next prime is 90334003. The reversal of 90333989 is 98933309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84033889 + 6300100 = 9167^2 + 2510^2 .

It is an emirp because it is prime and its reverse (98933309) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90333989 - 2⁴ = 90333973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90332989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45166994 + 45166995.

It is an arithmetic number, because the mean of its divisors is an integer number (45166995).

Almost surely, 2^90333989 is an apocalyptic number.

It is an amenable number.

90333989 is a deficient number, since it is larger than the sum of its proper divisors (1).

90333989 is an equidigital number, since it uses as much as digits as its factorization.

90333989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 90333989 is about 9504.4194457105. The cubic root of 90333989 is about 448.6941384468.

The spelling of 90333989 in words is "ninety million, three hundred thirty-three thousand, nine hundred eighty-nine".