1101981 has 8 divisors (see below), whose sum is σ = 1546720. Its totient is φ = 695952.

The previous prime is 1101967. The next prime is 1102001. The reversal of 1101981 is 1891011.

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

It is not a de Polignac number, because 1101981 - 2⁶ = 1101917 is a prime.

It is a super-2 number, since 2×1101981² = 2428724248722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101901) 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, 9610 + ... + 9723.

It is an arithmetic number, because the mean of its divisors is an integer number (193340).

2^1101981 is an apocalyptic number.

It is an amenable number.

1101981 is a deficient number, since it is larger than the sum of its proper divisors (444739).

1101981 is a wasteful number, since it uses less digits than its factorization.

1101981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19355.

The product of its (nonzero) digits is 72, while the sum is 21.

The square root of 1101981 is about 1049.7528280505. The cubic root of 1101981 is about 103.2899424713.

Adding to 1101981 its reverse (1891011), we get a palindrome (2992992).

The spelling of 1101981 in words is "one million, one hundred one thousand, nine hundred eighty-one".