118223731 has 4 divisors (see below), whose sum is σ = 118498464. Its totient is φ = 117949000.

The previous prime is 118223723. The next prime is 118223759. The reversal of 118223731 is 137322811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137322811 = 23 ⋅5970557.

It is a cyclic number.

It is not a de Polignac number, because 118223731 - 2³ = 118223723 is a prime.

It is a super-2 number, since 2×118223731² = 27953701143120722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 118223731.

It is not an unprimeable number, because it can be changed into a prime (118223431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136720 + ... + 137581.

It is an arithmetic number, because the mean of its divisors is an integer number (29624616).

Almost surely, 2^118223731 is an apocalyptic number.

118223731 is a deficient number, since it is larger than the sum of its proper divisors (274733).

118223731 is an equidigital number, since it uses as much as digits as its factorization.

118223731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274732.

The product of its digits is 2016, while the sum is 28.

The square root of 118223731 is about 10873.0736684711. The cubic root of 118223731 is about 490.7966092636.

The spelling of 118223731 in words is "one hundred eighteen million, two hundred twenty-three thousand, seven hundred thirty-one".