1216869229 has 4 divisors (see below), whose sum is σ = 1217154784. Its totient is φ = 1216583676.

The previous prime is 1216869223. The next prime is 1216869233. The reversal of 1216869229 is 9229686121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1216869229 - 2³ = 1216869221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216869221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136287 + ... + 144940.

It is an arithmetic number, because the mean of its divisors is an integer number (304288696).

Almost surely, 2^1216869229 is an apocalyptic number.

It is an amenable number.

1216869229 is a deficient number, since it is larger than the sum of its proper divisors (285555).

1216869229 is an equidigital number, since it uses as much as digits as its factorization.

1216869229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285554.

The product of its digits is 186624, while the sum is 46.

The square root of 1216869229 is about 34883.6527473830. The cubic root of 1216869229 is about 1067.6149248010.

The spelling of 1216869229 in words is "one billion, two hundred sixteen million, eight hundred sixty-nine thousand, two hundred twenty-nine".