1111777881 has 8 divisors (see below), whose sum is σ = 1483769280. Its totient is φ = 740485872.

The previous prime is 1111777867. The next prime is 1111777889. The reversal of 1111777881 is 1887771111.

It is a happy number.

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

It is not a de Polignac number, because 1111777881 - 2¹⁵ = 1111745113 is a prime.

It is a super-2 number, since 2×1111777881² = 2472100113361700322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1111777889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171126 + ... + 177503.

It is an arithmetic number, because the mean of its divisors is an integer number (185471160).

Almost surely, 2^1111777881 is an apocalyptic number.

It is an amenable number.

1111777881 is a deficient number, since it is larger than the sum of its proper divisors (371991399).

1111777881 is a wasteful number, since it uses less digits than its factorization.

1111777881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349695.

The product of its digits is 21952, while the sum is 42.

The square root of 1111777881 is about 33343.3333816522. Note that the first 4 decimals coincide. The cubic root of 1111777881 is about 1035.9513081298.

The spelling of 1111777881 in words is "one billion, one hundred eleven million, seven hundred seventy-seven thousand, eight hundred eighty-one".