1211552055 has 24 divisors (see below), whose sum is σ = 2400027552. Its totient is φ = 553852224.

The previous prime is 1211552051. The next prime is 1211552057. The reversal of 1211552055 is 5502551121.

1211552055 is a `hidden beast` number, since 121 + 15 + 520 + 5 + 5 = 666.

It is not a de Polignac number, because 1211552055 - 2² = 1211552051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211552051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1922784 + ... + 1923413.

It is an arithmetic number, because the mean of its divisors is an integer number (100001148).

Almost surely, 2^1211552055 is an apocalyptic number.

1211552055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211552055 is a deficient number, since it is larger than the sum of its proper divisors (1188475497).

1211552055 is a wasteful number, since it uses less digits than its factorization.

1211552055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846215 (or 3846212 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The square root of 1211552055 is about 34807.3563345451. The cubic root of 1211552055 is about 1066.0576545758.

The spelling of 1211552055 in words is "one billion, two hundred eleven million, five hundred fifty-two thousand, fifty-five".