1117981 has 4 divisors (see below), whose sum is σ = 1126912. Its totient is φ = 1109052.

The previous prime is 1117973. The next prime is 1117993. The reversal of 1117981 is 1897111.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1897111 = 41 ⋅46271.

It is a cyclic number.

It is not a de Polignac number, because 1117981 - 2³ = 1117973 is a prime.

It is a super-2 number, since 2×1117981² = 2499763032722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1117901) 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, 4275 + ... + 4528.

It is an arithmetic number, because the mean of its divisors is an integer number (281728).

2^1117981 is an apocalyptic number.

It is an amenable number.

1117981 is a deficient number, since it is larger than the sum of its proper divisors (8931).

1117981 is an equidigital number, since it uses as much as digits as its factorization.

1117981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8930.

The product of its digits is 504, while the sum is 28.

The square root of 1117981 is about 1057.3462063109. The cubic root of 1117981 is about 103.7874418498.

It can be divided in two parts, 11 and 17981, that multiplied together give a palindrome (197791).

The spelling of 1117981 in words is "one million, one hundred seventeen thousand, nine hundred eighty-one".