1216091518 has 8 divisors (see below), whose sum is σ = 1824323040. Its totient is φ = 607983840.

The previous prime is 1216091509. The next prime is 1216091521. The reversal of 1216091518 is 8151906121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363 + ... + 49318.

It is an arithmetic number, because the mean of its divisors is an integer number (228040380).

Almost surely, 2^1216091518 is an apocalyptic number.

1216091518 is a deficient number, since it is larger than the sum of its proper divisors (608231522).

1216091518 is a wasteful number, since it uses less digits than its factorization.

1216091518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61922.

The product of its (nonzero) digits is 4320, while the sum is 34.

The square root of 1216091518 is about 34872.5037529570. The cubic root of 1216091518 is about 1067.3874358765.

Adding to 1216091518 its reverse (8151906121), we get a palindrome (9367997639).

It can be divided in two parts, 1216091 and 518, that added together give a square (1216609 = 1103²).

The spelling of 1216091518 in words is "one billion, two hundred sixteen million, ninety-one thousand, five hundred eighteen".