90220771 has 2 divisors, whose sum is σ = 90220772. Its totient is φ = 90220770.

The previous prime is 90220747. The next prime is 90220807. The reversal of 90220771 is 17702209.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90220771 - 2⁹ = 90220259 is a prime.

It is not a weakly prime, because it can be changed into another prime (90220271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45110385 + 45110386.

It is an arithmetic number, because the mean of its divisors is an integer number (45110386).

Almost surely, 2^90220771 is an apocalyptic number.

90220771 is a deficient number, since it is larger than the sum of its proper divisors (1).

90220771 is an equidigital number, since it uses as much as digits as its factorization.

90220771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 90220771 is about 9498.4615070021. The cubic root of 90220771 is about 448.5066066313.

The spelling of 90220771 in words is "ninety million, two hundred twenty thousand, seven hundred seventy-one".