1939111881 has 16 divisors (see below), whose sum is σ = 2959724544. Its totient is φ = 1106231184.

The previous prime is 1939111879. The next prime is 1939111891. The reversal of 1939111881 is 1881119391.

It is not a de Polignac number, because 1939111881 - 2¹ = 1939111879 is a prime.

It is a super-2 number, since 2×1939111881² = 7520309774070716322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1939111841) 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, 63315 + ... + 88808.

It is an arithmetic number, because the mean of its divisors is an integer number (184982784).

Almost surely, 2^1939111881 is an apocalyptic number.

It is an amenable number.

1939111881 is a deficient number, since it is larger than the sum of its proper divisors (1020612663).

1939111881 is a wasteful number, since it uses less digits than its factorization.

1939111881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152740.

The product of its digits is 15552, while the sum is 42.

The square root of 1939111881 is about 44035.3480853734. The cubic root of 1939111881 is about 1247.0033564560.

The spelling of 1939111881 in words is "one billion, nine hundred thirty-nine million, one hundred eleven thousand, eight hundred eighty-one".