1218869807 has 2 divisors, whose sum is σ = 1218869808. Its totient is φ = 1218869806.

The previous prime is 1218869803. The next prime is 1218869809. The reversal of 1218869807 is 7089688121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1218869807 - 2² = 1218869803 is a prime.

Together with 1218869809, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218869803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609434903 + 609434904.

It is an arithmetic number, because the mean of its divisors is an integer number (609434904).

Almost surely, 2^1218869807 is an apocalyptic number.

1218869807 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218869807 is an equidigital number, since it uses as much as digits as its factorization.

1218869807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 50.

The square root of 1218869807 is about 34912.3159787488. The cubic root of 1218869807 is about 1068.1996706054.

The spelling of 1218869807 in words is "one billion, two hundred eighteen million, eight hundred sixty-nine thousand, eight hundred seven".