1218311 has 8 divisors (see below), whose sum is σ = 1257984. Its totient is φ = 1179360.

The previous prime is 1218307. The next prime is 1218313. The reversal of 1218311 is 1138121.

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 1218311 - 2² = 1218307 is a prime.

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 1218311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218313) 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, 6641 + ... + 6821.

It is an arithmetic number, because the mean of its divisors is an integer number (157248).

2^1218311 is an apocalyptic number.

1218311 is a deficient number, since it is larger than the sum of its proper divisors (39673).

1218311 is a wasteful number, since it uses less digits than its factorization.

1218311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361.

The product of its digits is 48, while the sum is 17.

The square root of 1218311 is about 1103.7712625359. The cubic root of 1218311 is about 106.8036402225.

The spelling of 1218311 in words is "one million, two hundred eighteen thousand, three hundred eleven".