1218654131 has 2 divisors, whose sum is σ = 1218654132. Its totient is φ = 1218654130.

The previous prime is 1218654121. The next prime is 1218654133. The reversal of 1218654131 is 1314568121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1218654131 - 2¹⁴ = 1218637747 is a prime.

It is a super-2 number, since 2×1218654131² = 2970235782006730322, which contains 22 as substring.

Together with 1218654133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1218654133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609327065 + 609327066.

It is an arithmetic number, because the mean of its divisors is an integer number (609327066).

Almost surely, 2^1218654131 is an apocalyptic number.

1218654131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218654131 is an equidigital number, since it uses as much as digits as its factorization.

1218654131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 32.

The square root of 1218654131 is about 34909.2270180822. The cubic root of 1218654131 is about 1068.1366617916.

The spelling of 1218654131 in words is "one billion, two hundred eighteen million, six hundred fifty-four thousand, one hundred thirty-one".