1849072181 has 4 divisors (see below), whose sum is σ = 2017169664. Its totient is φ = 1680974700.

The previous prime is 1849072123. The next prime is 1849072193. The reversal of 1849072181 is 1812709481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1849072181 - 2¹⁸ = 1848810037 is a prime.

It is a super-2 number, since 2×1849072181² = 6838135861096193522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1849072481) 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 3 ways as a sum of consecutive naturals, for example, 84048725 + ... + 84048746.

It is an arithmetic number, because the mean of its divisors is an integer number (504292416).

Almost surely, 2^1849072181 is an apocalyptic number.

1849072181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1849072181 is a deficient number, since it is larger than the sum of its proper divisors (168097483).

1849072181 is a wasteful number, since it uses less digits than its factorization.

1849072181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168097482.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 1849072181 is about 43000.8393057624. The cubic root of 1849072181 is about 1227.3957681705.

The spelling of 1849072181 in words is "one billion, eight hundred forty-nine million, seventy-two thousand, one hundred eighty-one".