90215851209 has 64 divisors (see below), whose sum is σ = 144154080000. Its totient is φ = 49540055040.

The previous prime is 90215851189. The next prime is 90215851217.

90215851209 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 90215851209 - 2¹¹ = 90215849161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90215851249) 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 63 ways as a sum of consecutive naturals, for example, 5669937 + ... + 5685825.

It is an arithmetic number, because the mean of its divisors is an integer number (2252407500).

Almost surely, 2^90215851209 is an apocalyptic number.

It is an amenable number.

90215851209 is a deficient number, since it is larger than the sum of its proper divisors (53938228791).

90215851209 is a wasteful number, since it uses less digits than its factorization.

90215851209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16298.

The product of its (nonzero) digits is 64800, while the sum is 42.

The spelling of 90215851209 in words is "ninety billion, two hundred fifteen million, eight hundred fifty-one thousand, two hundred nine".