1216869307 has 4 divisors (see below), whose sum is σ = 1280915080. Its totient is φ = 1152823536.

The previous prime is 1216869301. The next prime is 1216869337. The reversal of 1216869307 is 7039686121.

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 1216869307 - 2⁷ = 1216869179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216869301) 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, 32022858 + ... + 32022895.

It is an arithmetic number, because the mean of its divisors is an integer number (320228770).

Almost surely, 2^1216869307 is an apocalyptic number.

1216869307 is a deficient number, since it is larger than the sum of its proper divisors (64045773).

1216869307 is an equidigital number, since it uses as much as digits as its factorization.

1216869307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64045772.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 1216869307 is about 34883.6538653851. The cubic root of 1216869307 is about 1067.6149476120.

The spelling of 1216869307 in words is "one billion, two hundred sixteen million, eight hundred sixty-nine thousand, three hundred seven".