90854989 has 2 divisors, whose sum is σ = 90854990. Its totient is φ = 90854988.

The previous prime is 90854917. The next prime is 90855007. The reversal of 90854989 is 98945809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72080100 + 18774889 = 8490^2 + 4333^2 .

It is an emirp because it is prime and its reverse (98945809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90854989 - 2⁷ = 90854861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90854909) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45427494 + 45427495.

It is an arithmetic number, because the mean of its divisors is an integer number (45427495).

Almost surely, 2^90854989 is an apocalyptic number.

It is an amenable number.

90854989 is a deficient number, since it is larger than the sum of its proper divisors (1).

90854989 is an equidigital number, since it uses as much as digits as its factorization.

90854989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 52.

The square root of 90854989 is about 9531.7883421738. The cubic root of 90854989 is about 449.5550977312. Note that the first 3 decimals are identical.

The spelling of 90854989 in words is "ninety million, eight hundred fifty-four thousand, nine hundred eighty-nine".