1218098917 has 8 divisors (see below), whose sum is σ = 1395136512. Its totient is φ = 1041817200.

The previous prime is 1218098899. The next prime is 1218098923. The reversal of 1218098917 is 7198908121.

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 1218098917 - 2⁷ = 1218098789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218098957) 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, 185509 + ... + 191962.

It is an arithmetic number, because the mean of its divisors is an integer number (174392064).

Almost surely, 2^1218098917 is an apocalyptic number.

It is an amenable number.

1218098917 is a deficient number, since it is larger than the sum of its proper divisors (177037595).

1218098917 is an equidigital number, since it uses as much as digits as its factorization.

1218098917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377939.

The product of its (nonzero) digits is 72576, while the sum is 46.

The square root of 1218098917 is about 34901.2738592734. The cubic root of 1218098917 is about 1067.9744242053.

The spelling of 1218098917 in words is "one billion, two hundred eighteen million, ninety-eight thousand, nine hundred seventeen".