1881121913 has 8 divisors (see below), whose sum is σ = 2052508896. Its totient is φ = 1709797600.

The previous prime is 1881121849. The next prime is 1881121933. The reversal of 1881121913 is 3191211881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1881121913 - 2⁶ = 1881121849 is a prime.

It is a super-4 number, since 4×1881121913⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881121933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65333 + ... + 89613.

It is an arithmetic number, because the mean of its divisors is an integer number (256563612).

Almost surely, 2^1881121913 is an apocalyptic number.

It is an amenable number.

1881121913 is a deficient number, since it is larger than the sum of its proper divisors (171386983).

1881121913 is a wasteful number, since it uses less digits than its factorization.

1881121913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31335.

The product of its digits is 3456, while the sum is 35.

The square root of 1881121913 is about 43371.9023447208. The cubic root of 1881121913 is about 1234.4466179484.

The spelling of 1881121913 in words is "one billion, eight hundred eighty-one million, one hundred twenty-one thousand, nine hundred thirteen".