1111866981 has 4 divisors (see below), whose sum is σ = 1482489312. Its totient is φ = 741244652.

The previous prime is 1111866979. The next prime is 1111867013. The reversal of 1111866981 is 1896681111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1111866981 - 2¹ = 1111866979 is a prime.

It is a super-2 number, since 2×1111866981² = 2472496366876108722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111866901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185311161 + ... + 185311166.

It is an arithmetic number, because the mean of its divisors is an integer number (370622328).

Almost surely, 2^1111866981 is an apocalyptic number.

It is an amenable number.

1111866981 is a deficient number, since it is larger than the sum of its proper divisors (370622331).

1111866981 is an equidigital number, since it uses as much as digits as its factorization.

1111866981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370622330.

The product of its digits is 20736, while the sum is 42.

The square root of 1111866981 is about 33344.6694540522. The cubic root of 1111866981 is about 1035.9789817618.

The spelling of 1111866981 in words is "one billion, one hundred eleven million, eight hundred sixty-six thousand, nine hundred eighty-one".