1212801656 has 32 divisors (see below), whose sum is σ = 2483412480. Its totient is φ = 550677600.

The previous prime is 1212801631. The next prime is 1212801683. The reversal of 1212801656 is 6561082121.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 80255 + ... + 94161.

It is an arithmetic number, because the mean of its divisors is an integer number (77606640).

Almost surely, 2^1212801656 is an apocalyptic number.

It is an amenable number.

1212801656 is an abundant number, since it is smaller than the sum of its proper divisors (1270610824).

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

1212801656 is a wasteful number, since it uses less digits than its factorization.

1212801656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14915 (or 14911 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 1212801656 is about 34825.3019513112. The cubic root of 1212801656 is about 1066.4240410836.

Adding to 1212801656 its reverse (6561082121), we get a palindrome (7773883777).

The spelling of 1212801656 in words is "one billion, two hundred twelve million, eight hundred one thousand, six hundred fifty-six".