1111388861 has 8 divisors (see below), whose sum is σ = 1212737184. Its totient is φ = 1010092720.

The previous prime is 1111388857. The next prime is 1111388867. The reversal of 1111388861 is 1688831111.

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 1111388861 - 2² = 1111388857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111388867) 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 7 ways as a sum of consecutive naturals, for example, 41390 + ... + 62736.

It is an arithmetic number, because the mean of its divisors is an integer number (151592148).

Almost surely, 2^1111388861 is an apocalyptic number.

1111388861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111388861 is a deficient number, since it is larger than the sum of its proper divisors (101348323).

1111388861 is a wasteful number, since it uses less digits than its factorization.

1111388861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26091.

The product of its digits is 9216, while the sum is 38.

The square root of 1111388861 is about 33337.4993213348. The cubic root of 1111388861 is about 1035.8304648094.

The spelling of 1111388861 in words is "one billion, one hundred eleven million, three hundred eighty-eight thousand, eight hundred sixty-one".