1216031187 has 12 divisors (see below), whose sum is σ = 1886089416. Its totient is φ = 694874880.

The previous prime is 1216031143. The next prime is 1216031197. The reversal of 1216031187 is 7811306121.

1216031187 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1216031187 - 2⁷ = 1216031059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216031197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4136014 + ... + 4136307.

It is an arithmetic number, because the mean of its divisors is an integer number (157174118).

Almost surely, 2^1216031187 is an apocalyptic number.

1216031187 is a deficient number, since it is larger than the sum of its proper divisors (670058229).

1216031187 is an equidigital number, since it uses as much as digits as its factorization.

1216031187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8272338 (or 8272331 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 1216031187 is about 34871.6387197390. The cubic root of 1216031187 is about 1067.3697843496.

The spelling of 1216031187 in words is "one billion, two hundred sixteen million, thirty-one thousand, one hundred eighty-seven".