90442219 has 4 divisors (see below), whose sum is σ = 103362544. Its totient is φ = 77521896.

The previous prime is 90442217. The next prime is 90442229. The reversal of 90442219 is 91224409.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90442219 - 2¹ = 90442217 is a prime.

It is a super-2 number, since 2×90442219² = 16359589955287922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90442211) 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 in 3 ways as a sum of consecutive naturals, for example, 6460152 + ... + 6460165.

It is an arithmetic number, because the mean of its divisors is an integer number (25840636).

Almost surely, 2^90442219 is an apocalyptic number.

90442219 is a deficient number, since it is larger than the sum of its proper divisors (12920325).

90442219 is a wasteful number, since it uses less digits than its factorization.

90442219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12920324.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 90442219 is about 9510.1114083905. Note that the first 3 decimals coincide. The cubic root of 90442219 is about 448.8732618154.

The spelling of 90442219 in words is "ninety million, four hundred forty-two thousand, two hundred nineteen".