1218043231 has 8 divisors (see below), whose sum is σ = 1232476560. Its totient is φ = 1203626688.

The previous prime is 1218043213. The next prime is 1218043237. The reversal of 1218043231 is 1323408121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1218043231 - 2⁵ = 1218043199 is a prime.

It is a super-2 number, since 2×1218043231² = 2967258625169838722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1218043196 and 1218043205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218043237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198745 + ... + 204781.

It is an arithmetic number, because the mean of its divisors is an integer number (154059570).

Almost surely, 2^1218043231 is an apocalyptic number.

1218043231 is a deficient number, since it is larger than the sum of its proper divisors (14433329).

1218043231 is an equidigital number, since it uses as much as digits as its factorization.

1218043231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8393.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1218043231 is about 34900.4760855780. The cubic root of 1218043231 is about 1067.9581496293.

The spelling of 1218043231 in words is "one billion, two hundred eighteen million, forty-three thousand, two hundred thirty-one".