1216334525 has 24 divisors (see below), whose sum is σ = 1734335424. Its totient is φ = 828921600.

The previous prime is 1216334503. The next prime is 1216334527. The reversal of 1216334525 is 5254336121.

It is a happy number.

It is not a de Polignac number, because 1216334525 - 2¹⁰ = 1216333501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216334491 and 1216334500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216334527) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 7205 + ... + 49845.

It is an arithmetic number, because the mean of its divisors is an integer number (72263976).

Almost surely, 2^1216334525 is an apocalyptic number.

It is an amenable number.

1216334525 is a deficient number, since it is larger than the sum of its proper divisors (518000899).

1216334525 is a wasteful number, since it uses less digits than its factorization.

1216334525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42821 (or 42816 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 1216334525 is about 34875.9877996309. The cubic root of 1216334525 is about 1067.4585284819.

The spelling of 1216334525 in words is "one billion, two hundred sixteen million, three hundred thirty-four thousand, five hundred twenty-five".