1212138568 has 8 divisors (see below), whose sum is σ = 2272759830. Its totient is φ = 606069280.

The previous prime is 1212138559. The next prime is 1212138593. The reversal of 1212138568 is 8658312121.

It can be written as a sum of positive squares in only one way, i.e., 1158585444 + 53553124 = 34038^2 + 7318^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75758653 + ... + 75758668.

Almost surely, 2^1212138568 is an apocalyptic number.

It is an amenable number.

1212138568 is a deficient number, since it is larger than the sum of its proper divisors (1060621262).

1212138568 is a wasteful number, since it uses less digits than its factorization.

1212138568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151517327 (or 151517323 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 1212138568 is about 34815.7804450798. The cubic root of 1212138568 is about 1066.2296531848.

The spelling of 1212138568 in words is "one billion, two hundred twelve million, one hundred thirty-eight thousand, five hundred sixty-eight".