1216454452 has 12 divisors (see below), whose sum is σ = 2221351776. Its totient is φ = 581782520.

The previous prime is 1216454443. The next prime is 1216454453. The reversal of 1216454452 is 2544546121.

It is a super-2 number, since 2×1216454452² = 2959522867581240608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216454453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6611074 + ... + 6611257.

It is an arithmetic number, because the mean of its divisors is an integer number (185112648).

Almost surely, 2^1216454452 is an apocalyptic number.

It is an amenable number.

1216454452 is a deficient number, since it is larger than the sum of its proper divisors (1004897324).

1216454452 is a wasteful number, since it uses less digits than its factorization.

1216454452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13222358 (or 13222356 counting only the distinct ones).

The product of its digits is 38400, while the sum is 34.

The square root of 1216454452 is about 34877.7070920667. The cubic root of 1216454452 is about 1067.4936100841.

The spelling of 1216454452 in words is "one billion, two hundred sixteen million, four hundred fifty-four thousand, four hundred fifty-two".