1212055647 has 16 divisors (see below), whose sum is σ = 1866696192. Its totient is φ = 691368320.

The previous prime is 1212055591. The next prime is 1212055673. The reversal of 1212055647 is 7465502121.

It is a cyclic number.

It is not a de Polignac number, because 1212055647 - 2⁷ = 1212055519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212055547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1079703 + ... + 1080824.

It is an arithmetic number, because the mean of its divisors is an integer number (116668512).

Almost surely, 2^1212055647 is an apocalyptic number.

1212055647 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1212055647 is a deficient number, since it is larger than the sum of its proper divisors (654640545).

1212055647 is a wasteful number, since it uses less digits than its factorization.

1212055647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160558.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 1212055647 is about 34814.5895710405. The cubic root of 1212055647 is about 1066.2053394505.

Adding to 1212055647 its reverse (7465502121), we get a palindrome (8677557768).

The spelling of 1212055647 in words is "one billion, two hundred twelve million, fifty-five thousand, six hundred forty-seven".