90409433 has 2 divisors, whose sum is σ = 90409434. Its totient is φ = 90409432.

The previous prime is 90409409. The next prime is 90409439. The reversal of 90409433 is 33490409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85969984 + 4439449 = 9272^2 + 2107^2 .

It is an emirp because it is prime and its reverse (33490409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90409433 - 2⁶ = 90409369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90409433.

It is not a weakly prime, because it can be changed into another prime (90409439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45204716 + 45204717.

It is an arithmetic number, because the mean of its divisors is an integer number (45204717).

Almost surely, 2^90409433 is an apocalyptic number.

It is an amenable number.

90409433 is a deficient number, since it is larger than the sum of its proper divisors (1).

90409433 is an equidigital number, since it uses as much as digits as its factorization.

90409433 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 32.

The square root of 90409433 is about 9508.3875078796. The cubic root of 90409433 is about 448.8190152567.

The spelling of 90409433 in words is "ninety million, four hundred nine thousand, four hundred thirty-three".