1212201987 has 4 divisors (see below), whose sum is σ = 1616269320. Its totient is φ = 808134656.

The previous prime is 1212201973. The next prime is 1212201997. The reversal of 1212201987 is 7891022121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212201987 - 2²³ = 1203813379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212201997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202033662 + ... + 202033667.

It is an arithmetic number, because the mean of its divisors is an integer number (404067330).

Almost surely, 2^1212201987 is an apocalyptic number.

1212201987 is a deficient number, since it is larger than the sum of its proper divisors (404067333).

1212201987 is an equidigital number, since it uses as much as digits as its factorization.

1212201987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404067332.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 1212201987 is about 34816.6912126928. The cubic root of 1212201987 is about 1066.2482478793.

The spelling of 1212201987 in words is "one billion, two hundred twelve million, two hundred one thousand, nine hundred eighty-seven".