1218161052 has 96 divisors (see below), whose sum is σ = 3304949760. Its totient is φ = 387288000.

The previous prime is 1218161039. The next prime is 1218161069. The reversal of 1218161052 is 2501618121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1621677 + ... + 1622427.

It is an arithmetic number, because the mean of its divisors is an integer number (34426560).

Almost surely, 2^1218161052 is an apocalyptic number.

1218161052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218161052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1652474880).

1218161052 is an abundant number, since it is smaller than the sum of its proper divisors (2086788708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218161052 is a wasteful number, since it uses less digits than its factorization.

1218161052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440 (or 1432 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 1218161052 is about 34902.1640016776. The cubic root of 1218161052 is about 1067.9925829557.

Adding to 1218161052 its reverse (2501618121), we get a palindrome (3719779173).

The spelling of 1218161052 in words is "one billion, two hundred eighteen million, one hundred sixty-one thousand, fifty-two".