1216305534 has 8 divisors (see below), whose sum is σ = 2432611080. Its totient is φ = 405435176.

The previous prime is 1216305523. The next prime is 1216305569. The reversal of 1216305534 is 4355036121.

It is a sphenic number, since it is the product of 3 distinct primes.

1216305534 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101358789 + ... + 101358800.

It is an arithmetic number, because the mean of its divisors is an integer number (304076385).

Almost surely, 2^1216305534 is an apocalyptic number.

1216305534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1216305534 is a wasteful number, since it uses less digits than its factorization.

1216305534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202717594.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 1216305534 is about 34875.5721673495. The cubic root of 1216305534 is about 1067.4500475541.

The spelling of 1216305534 in words is "one billion, two hundred sixteen million, three hundred five thousand, five hundred thirty-four".