1212558116 has 72 divisors (see below), whose sum is σ = 2851311456. Its totient is φ = 444622080.

The previous prime is 1212558107. The next prime is 1212558173. The reversal of 1212558116 is 6118552121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20111 + ... + 53193.

It is an arithmetic number, because the mean of its divisors is an integer number (39601548).

Almost surely, 2^1212558116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212558116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1425655728).

1212558116 is an abundant number, since it is smaller than the sum of its proper divisors (1638753340).

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

1212558116 is a wasteful number, since it uses less digits than its factorization.

1212558116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33129 (or 33120 counting only the distinct ones).

The product of its digits is 4800, while the sum is 32.

The square root of 1212558116 is about 34821.8051800880. The cubic root of 1212558116 is about 1066.3526542260.

The spelling of 1212558116 in words is "one billion, two hundred twelve million, five hundred fifty-eight thousand, one hundred sixteen".