1218650073 has 16 divisors (see below), whose sum is σ = 1650390336. Its totient is φ = 799742720.

The previous prime is 1218650051. The next prime is 1218650089. The reversal of 1218650073 is 3700568121.

1218650073 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1218650073 - 2¹² = 1218645977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218650023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61261 + ... + 78677.

It is an arithmetic number, because the mean of its divisors is an integer number (103149396).

Almost surely, 2^1218650073 is an apocalyptic number.

It is an amenable number.

1218650073 is a deficient number, since it is larger than the sum of its proper divisors (431740263).

1218650073 is a wasteful number, since it uses less digits than its factorization.

1218650073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17784.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 1218650073 is about 34909.1688958646. The cubic root of 1218650073 is about 1068.1354761931.

The spelling of 1218650073 in words is "one billion, two hundred eighteen million, six hundred fifty thousand, seventy-three".