201822028491 has 4 divisors (see below), whose sum is σ = 269096037992. Its totient is φ = 134548018992.

The previous prime is 201822028477. The next prime is 201822028501. The reversal of 201822028491 is 194820228102.

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

It is not a de Polignac number, because 201822028491 - 2¹⁵ = 201821995723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201822021491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33637004746 + ... + 33637004751.

It is an arithmetic number, because the mean of its divisors is an integer number (67274009498).

Almost surely, 2^201822028491 is an apocalyptic number.

201822028491 is a deficient number, since it is larger than the sum of its proper divisors (67274009501).

201822028491 is an equidigital number, since it uses as much as digits as its factorization.

201822028491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67274009500.

The product of its (nonzero) digits is 36864, while the sum is 39.

The spelling of 201822028491 in words is "two hundred one billion, eight hundred twenty-two million, twenty-eight thousand, four hundred ninety-one".