90219769 has 2 divisors, whose sum is σ = 90219770. Its totient is φ = 90219768.

The previous prime is 90219763. The next prime is 90219781. The reversal of 90219769 is 96791209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52027369 + 38192400 = 7213^2 + 6180^2 .

It is an emirp because it is prime and its reverse (96791209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90219769 - 2³ = 90219761 is a prime.

It is a super-2 number, since 2×90219769² = 16279213436826722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90219761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45109884 + 45109885.

It is an arithmetic number, because the mean of its divisors is an integer number (45109885).

Almost surely, 2^90219769 is an apocalyptic number.

It is an amenable number.

90219769 is a deficient number, since it is larger than the sum of its proper divisors (1).

90219769 is an equidigital number, since it uses as much as digits as its factorization.

90219769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 90219769 is about 9498.4087614716. The cubic root of 90219769 is about 448.5049462403.

The spelling of 90219769 in words is "ninety million, two hundred nineteen thousand, seven hundred sixty-nine".