1218884513 has 32 divisors (see below), whose sum is σ = 1639491840. Its totient is φ = 876994560.

The previous prime is 1218884473. The next prime is 1218884539. The reversal of 1218884513 is 3154888121.

It is a cyclic number.

It is not a de Polignac number, because 1218884513 - 2¹² = 1218880417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218887513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60593 + ... + 78161.

It is an arithmetic number, because the mean of its divisors is an integer number (51234120).

Almost surely, 2^1218884513 is an apocalyptic number.

It is an amenable number.

1218884513 is a deficient number, since it is larger than the sum of its proper divisors (420607327).

1218884513 is a wasteful number, since it uses less digits than its factorization.

1218884513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17657.

The product of its digits is 61440, while the sum is 41.

The square root of 1218884513 is about 34912.5265914686. The cubic root of 1218884513 is about 1068.2039666292.

The spelling of 1218884513 in words is "one billion, two hundred eighteen million, eight hundred eighty-four thousand, five hundred thirteen".