1822549861 has 16 divisors (see below), whose sum is σ = 2054301696. Its totient is φ = 1601910000.

The previous prime is 1822549843. The next prime is 1822549867. The reversal of 1822549861 is 1689452281.

It is a cyclic number.

It is not a de Polignac number, because 1822549861 - 2⁹ = 1822549349 is a prime.

It is a super-4 number, since 4×1822549861⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1822549867) 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 15 ways as a sum of consecutive naturals, for example, 520326 + ... + 523816.

It is an arithmetic number, because the mean of its divisors is an integer number (128393856).

Almost surely, 2^1822549861 is an apocalyptic number.

1822549861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1822549861 is a deficient number, since it is larger than the sum of its proper divisors (231751835).

1822549861 is a wasteful number, since it uses less digits than its factorization.

1822549861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064.

The product of its digits is 276480, while the sum is 46.

The square root of 1822549861 is about 42691.3323872657. The cubic root of 1822549861 is about 1221.4990667552.

It can be divided in two parts, 18225 and 49861, that added together give a palindrome (68086).

The spelling of 1822549861 in words is "one billion, eight hundred twenty-two million, five hundred forty-nine thousand, eight hundred sixty-one".