1216012747 has 4 divisors (see below), whose sum is σ = 1227818800. Its totient is φ = 1204206696.

The previous prime is 1216012741. The next prime is 1216012751. The reversal of 1216012747 is 7472106121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7472106121 = 719 ⋅10392359.

It is a cyclic number.

It is not a de Polignac number, because 1216012747 - 2¹⁵ = 1215979979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216012741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5902872 + ... + 5903077.

It is an arithmetic number, because the mean of its divisors is an integer number (306954700).

Almost surely, 2^1216012747 is an apocalyptic number.

1216012747 is a deficient number, since it is larger than the sum of its proper divisors (11806053).

1216012747 is a wasteful number, since it uses less digits than its factorization.

1216012747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11806052.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 1216012747 is about 34871.3743204939. The cubic root of 1216012747 is about 1067.3643890937.

Adding to 1216012747 its reverse (7472106121), we get a palindrome (8688118868).

The spelling of 1216012747 in words is "one billion, two hundred sixteen million, twelve thousand, seven hundred forty-seven".