90215233 has 2 divisors, whose sum is σ = 90215234. Its totient is φ = 90215232.

The previous prime is 90215219. The next prime is 90215261. The reversal of 90215233 is 33251209.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87834384 + 2380849 = 9372^2 + 1543^2 .

It is an emirp because it is prime and its reverse (33251209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90215233 - 2⁹ = 90214721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90215198 and 90215207.

It is not a weakly prime, because it can be changed into another prime (90215033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45107616 + 45107617.

It is an arithmetic number, because the mean of its divisors is an integer number (45107617).

Almost surely, 2^90215233 is an apocalyptic number.

It is an amenable number.

90215233 is a deficient number, since it is larger than the sum of its proper divisors (1).

90215233 is an equidigital number, since it uses as much as digits as its factorization.

90215233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 90215233 is about 9498.1699816333. The cubic root of 90215233 is about 448.4974295857.

The spelling of 90215233 in words is "ninety million, two hundred fifteen thousand, two hundred thirty-three".