1118631 has 4 divisors (see below), whose sum is σ = 1491512. Its totient is φ = 745752.

The previous prime is 1118629. The next prime is 1118653. The reversal of 1118631 is 1368111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1368111 = 3 ⋅456037.

It is not a de Polignac number, because 1118631 - 2¹ = 1118629 is a prime.

It is a super-2 number, since 2×1118631² = 2502670628322, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1118598 and 1118607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1116631) 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, 186436 + ... + 186441.

It is an arithmetic number, because the mean of its divisors is an integer number (372878).

2^1118631 is an apocalyptic number.

1118631 is a deficient number, since it is larger than the sum of its proper divisors (372881).

1118631 is an equidigital number, since it uses as much as digits as its factorization.

1118631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372880.

The product of its digits is 144, while the sum is 21.

The square root of 1118631 is about 1057.6535349537. The cubic root of 1118631 is about 103.8075521400.

The spelling of 1118631 in words is "one million, one hundred eighteen thousand, six hundred thirty-one".