1881138169 has 16 divisors (see below), whose sum is σ = 1945762560. Its totient is φ = 1817786880.

The previous prime is 1881138151. The next prime is 1881138173. The reversal of 1881138169 is 9618311881.

It is a cyclic number.

It is not a de Polignac number, because 1881138169 - 2⁵ = 1881138137 is a prime.

It is a super-2 number, since 2×1881138169² = 7077361621737345122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881138109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1227934 + ... + 1229464.

It is an arithmetic number, because the mean of its divisors is an integer number (121610160).

Almost surely, 2^1881138169 is an apocalyptic number.

It is an amenable number.

1881138169 is a deficient number, since it is larger than the sum of its proper divisors (64624391).

1881138169 is a wasteful number, since it uses less digits than its factorization.

1881138169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920.

The product of its digits is 82944, while the sum is 46.

The square root of 1881138169 is about 43372.0897467484. The cubic root of 1881138169 is about 1234.4501738240.

The spelling of 1881138169 in words is "one billion, eight hundred eighty-one million, one hundred thirty-eight thousand, one hundred sixty-nine".