90102219 has 4 divisors (see below), whose sum is σ = 120136296. Its totient is φ = 60068144.

The previous prime is 90102211. The next prime is 90102251. The reversal of 90102219 is 91220109.

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 90102219 - 2³ = 90102211 is a prime.

It is a super-2 number, since 2×90102219² = 16236819737447922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90102211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15017034 + ... + 15017039.

It is an arithmetic number, because the mean of its divisors is an integer number (30034074).

Almost surely, 2^90102219 is an apocalyptic number.

90102219 is a deficient number, since it is larger than the sum of its proper divisors (30034077).

90102219 is a wasteful number, since it uses less digits than its factorization.

90102219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30034076.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 90102219 is about 9492.2188659976. The cubic root of 90102219 is about 448.3100714688.

The spelling of 90102219 in words is "ninety million, one hundred two thousand, two hundred nineteen".