1810220181 has 48 divisors (see below), whose sum is σ = 3128232960. Its totient is φ = 920327520.

The previous prime is 1810220161. The next prime is 1810220183.

1810220181 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1810220181 - 2⁷ = 1810220053 is a prime.

It is a super-2 number, since 2×1810220181² = 6553794207399345522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1810220183) 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 47 ways as a sum of consecutive naturals, for example, 64090 + ... + 87908.

It is an arithmetic number, because the mean of its divisors is an integer number (65171520).

Almost surely, 2^1810220181 is an apocalyptic number.

1810220181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1810220181 is a deficient number, since it is larger than the sum of its proper divisors (1318012779).

1810220181 is a wasteful number, since it uses less digits than its factorization.

1810220181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23894 (or 23887 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 24.

The square root of 1810220181 is about 42546.6823735999. The cubic root of 1810220181 is about 1218.7383223391.

It can be divided in two parts, 18102 and 20181, that added together give a palindrome (38283).

The spelling of 1810220181 in words is "one billion, eight hundred ten million, two hundred twenty thousand, one hundred eighty-one".