1118491 has 4 divisors (see below), whose sum is σ = 1220184. Its totient is φ = 1016800.

The previous prime is 1118483. The next prime is 1118497. The reversal of 1118491 is 1948111.

1118491 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1948111 = 11 ⋅177101.

It is a cyclic number.

It is not a de Polignac number, because 1118491 - 2³ = 1118483 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1118497) 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, 50830 + ... + 50851.

It is an arithmetic number, because the mean of its divisors is an integer number (305046).

2^1118491 is an apocalyptic number.

1118491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1118491 is a deficient number, since it is larger than the sum of its proper divisors (101693).

1118491 is a wasteful number, since it uses less digits than its factorization.

1118491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101692.

The product of its digits is 288, while the sum is 25.

The square root of 1118491 is about 1057.5873486384. The cubic root of 1118491 is about 103.8032213513.

It can be divided in two parts, 11 and 18491, that multiplied together give a square (203401 = 451²).

The spelling of 1118491 in words is "one million, one hundred eighteen thousand, four hundred ninety-one".