1109971 has 4 divisors (see below), whose sum is σ = 1121512. Its totient is φ = 1098432.

The previous prime is 1109951. The next prime is 1109987. The reversal of 1109971 is 1799011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1109971 - 2¹¹ = 1107923 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 (1109921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5625 + ... + 5818.

It is an arithmetic number, because the mean of its divisors is an integer number (280378).

2^1109971 is an apocalyptic number.

1109971 is a deficient number, since it is larger than the sum of its proper divisors (11541).

1109971 is an equidigital number, since it uses as much as digits as its factorization.

1109971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11540.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 1109971 is about 1053.5516124044. The cubic root of 1109971 is about 103.5389788383.

It can be divided in two parts, 1109 and 971, that added together give a triangular number (2080 = T₆₄).

The spelling of 1109971 in words is "one million, one hundred nine thousand, nine hundred seventy-one".