90211019 has 4 divisors (see below), whose sum is σ = 90683520. Its totient is φ = 89738520.

The previous prime is 90211003. The next prime is 90211039. The reversal of 90211019 is 91011209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91011209 = 4831 ⋅18839.

It is a cyclic number.

It is not a de Polignac number, because 90211019 - 2⁴ = 90211003 is a prime.

It is a super-2 number, since 2×90211019² = 16276055898036722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90210985 and 90211003.

It is not an unprimeable number, because it can be changed into a prime (90211039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235964 + ... + 236345.

It is an arithmetic number, because the mean of its divisors is an integer number (22670880).

Almost surely, 2^90211019 is an apocalyptic number.

90211019 is a deficient number, since it is larger than the sum of its proper divisors (472501).

90211019 is a wasteful number, since it uses less digits than its factorization.

90211019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472500.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 90211019 is about 9497.9481468368. The cubic root of 90211019 is about 448.4904462949.

The spelling of 90211019 in words is "ninety million, two hundred eleven thousand, nineteen".