1216255306 has 16 divisors (see below), whose sum is σ = 2092132224. Its totient is φ = 519471504.

The previous prime is 1216255297. The next prime is 1216255349. The reversal of 1216255306 is 6035526121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144150 + ... + 152353.

It is an arithmetic number, because the mean of its divisors is an integer number (130758264).

Almost surely, 2^1216255306 is an apocalyptic number.

1216255306 is a deficient number, since it is larger than the sum of its proper divisors (875876918).

1216255306 is a wasteful number, since it uses less digits than its factorization.

1216255306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296805.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1216255306 is about 34874.8520570339. The cubic root of 1216255306 is about 1067.4353537079.

The spelling of 1216255306 in words is "one billion, two hundred sixteen million, two hundred fifty-five thousand, three hundred six".