90821019 has 12 divisors (see below), whose sum is σ = 121873448. Its totient is φ = 60159840.

The previous prime is 90820963. The next prime is 90821023. The reversal of 90821019 is 91012809.

It is not a de Polignac number, because 90821019 - 2¹⁷ = 90689947 is a prime.

It is a super-2 number, since 2×90821019² = 16496914984396722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90821039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 290007 + ... + 290319.

Almost surely, 2^90821019 is an apocalyptic number.

90821019 is a deficient number, since it is larger than the sum of its proper divisors (31052429).

90821019 is an equidigital number, since it uses as much as digits as its factorization.

90821019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 90821019 is about 9530.0062434397. The cubic root of 90821019 is about 449.4990623188.

It can be divided in two parts, 9082 and 1019, that added together give a palindrome (10101).

The spelling of 90821019 in words is "ninety million, eight hundred twenty-one thousand, nineteen".