1216633501 has 8 divisors (see below), whose sum is σ = 1226234240. Its totient is φ = 1207045152.

The previous prime is 1216633487. The next prime is 1216633541. The reversal of 1216633501 is 1053366121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216633501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216633501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216633541) 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 7 ways as a sum of consecutive naturals, for example, 329401 + ... + 333073.

It is an arithmetic number, because the mean of its divisors is an integer number (153279280).

Almost surely, 2^1216633501 is an apocalyptic number.

It is an amenable number.

1216633501 is a deficient number, since it is larger than the sum of its proper divisors (9600739).

1216633501 is a wasteful number, since it uses less digits than its factorization.

1216633501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6195.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1216633501 is about 34880.2738091317. The cubic root of 1216633501 is about 1067.5459820372.

Adding to 1216633501 its reverse (1053366121), we get a palindrome (2269999622).

The spelling of 1216633501 in words is "one billion, two hundred sixteen million, six hundred thirty-three thousand, five hundred one".