1218131 has 2 divisors, whose sum is σ = 1218132. Its totient is φ = 1218130.

The previous prime is 1218121. The next prime is 1218157. The reversal of 1218131 is 1318121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1218131 - 2¹⁰ = 1217107 is a prime.

It is a super-2 number, since 2×1218131² = 2967686266322, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 11.

It is not a weakly prime, because it can be changed into another prime (1218121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609065 + 609066.

It is an arithmetic number, because the mean of its divisors is an integer number (609066).

2^1218131 is an apocalyptic number.

1218131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218131 is an equidigital number, since it uses as much as digits as its factorization.

1218131 is an evil number, because the sum of its binary digits is even.

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

The square root of 1218131 is about 1103.6897208908. The cubic root of 1218131 is about 106.7983800434.

The spelling of 1218131 in words is "one million, two hundred eighteen thousand, one hundred thirty-one".