1216567275 has 96 divisors (see below), whose sum is σ = 2529885696. Its totient is φ = 505296000.

The previous prime is 1216567273. The next prime is 1216567279. The reversal of 1216567275 is 5727656121.

It is a happy number.

1216567275 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 1216567275 - 2¹ = 1216567273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216567273) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 697905 + ... + 699645.

It is an arithmetic number, because the mean of its divisors is an integer number (26352976).

Almost surely, 2^1216567275 is an apocalyptic number.

1216567275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216567275 is an abundant number, since it is smaller than the sum of its proper divisors (1313318421).

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

1216567275 is a wasteful number, since it uses less digits than its factorization.

1216567275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 1767 counting only the distinct ones).

The product of its digits is 176400, while the sum is 42.

The square root of 1216567275 is about 34879.3244630684. The cubic root of 1216567275 is about 1067.5266114864.

The spelling of 1216567275 in words is "one billion, two hundred sixteen million, five hundred sixty-seven thousand, two hundred seventy-five".