90821219 has 2 divisors, whose sum is σ = 90821220. Its totient is φ = 90821218.

The previous prime is 90821201. The next prime is 90821221. The reversal of 90821219 is 91212809.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90821219 - 2⁸ = 90820963 is a prime.

It is a super-2 number, since 2×90821219² = 16496987641291922, which contains 22 as substring.

Together with 90821221, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90821239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45410609 + 45410610.

It is an arithmetic number, because the mean of its divisors is an integer number (45410610).

Almost surely, 2^90821219 is an apocalyptic number.

90821219 is a deficient number, since it is larger than the sum of its proper divisors (1).

90821219 is an equidigital number, since it uses as much as digits as its factorization.

90821219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 90821219 is about 9530.0167366065. The cubic root of 90821219 is about 449.4993922708.

It can be divided in two parts, 9082 and 1219, that added together give a palindrome (10301).

The spelling of 90821219 in words is "ninety million, eight hundred twenty-one thousand, two hundred nineteen".