1216552651 has 8 divisors (see below), whose sum is σ = 1226650064. Its totient is φ = 1206485280.

The previous prime is 1216552643. The next prime is 1216552669. The reversal of 1216552651 is 1562556121.

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

It is a cyclic number.

It is not a de Polignac number, because 1216552651 - 2³ = 1216552643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216552681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77776 + ... + 92098.

It is an arithmetic number, because the mean of its divisors is an integer number (153331258).

Almost surely, 2^1216552651 is an apocalyptic number.

1216552651 is a deficient number, since it is larger than the sum of its proper divisors (10097413).

1216552651 is a wasteful number, since it uses less digits than its factorization.

1216552651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15021.

The product of its digits is 18000, while the sum is 34.

The square root of 1216552651 is about 34879.1148253507. The cubic root of 1216552651 is about 1067.5223339941.

The spelling of 1216552651 in words is "one billion, two hundred sixteen million, five hundred fifty-two thousand, six hundred fifty-one".