1121731 has 4 divisors (see below), whose sum is σ = 1208032. Its totient is φ = 1035432.

The previous prime is 1121723. The next prime is 1121737. The reversal of 1121731 is 1371211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1371211 = 19 ⋅72169.

It is a cyclic number.

It is not a de Polignac number, because 1121731 - 2³ = 1121723 is a prime.

It is a super-2 number, since 2×1121731² = 2516560872722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121737) 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, 43131 + ... + 43156.

It is an arithmetic number, because the mean of its divisors is an integer number (302008).

2^1121731 is an apocalyptic number.

1121731 is a deficient number, since it is larger than the sum of its proper divisors (86301).

1121731 is an equidigital number, since it uses as much as digits as its factorization.

1121731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86300.

The product of its digits is 42, while the sum is 16.

The square root of 1121731 is about 1059.1180293055. The cubic root of 1121731 is about 103.9033557318.

Adding to 1121731 its reverse (1371211), we get a palindrome (2492942).

The spelling of 1121731 in words is "one million, one hundred twenty-one thousand, seven hundred thirty-one".