1216217634 has 32 divisors (see below), whose sum is σ = 2509262016. Its totient is φ = 392800320.

The previous prime is 1216217623. The next prime is 1216217657. The reversal of 1216217634 is 4367126121.

It is a junction number, because it is equal to n+sod(n) for n = 1216217595 and 1216217604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277 + ... + 49320.

It is an arithmetic number, because the mean of its divisors is an integer number (78414438).

Almost surely, 2^1216217634 is an apocalyptic number.

1216217634 is an abundant number, since it is smaller than the sum of its proper divisors (1293044382).

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

1216217634 is a wasteful number, since it uses less digits than its factorization.

1216217634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49730.

The product of its digits is 12096, while the sum is 33.

The square root of 1216217634 is about 34874.3119502020. The cubic root of 1216217634 is about 1067.4243327653.

The spelling of 1216217634 in words is "one billion, two hundred sixteen million, two hundred seventeen thousand, six hundred thirty-four".