1216011247 has 8 divisors (see below), whose sum is σ = 1329870672. Its totient is φ = 1102704000.

The previous prime is 1216011227. The next prime is 1216011257. The reversal of 1216011247 is 7421106121.

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 1216011247 - 2¹¹ = 1216009199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216011217) 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, 133428 + ... + 142249.

It is an arithmetic number, because the mean of its divisors is an integer number (166233834).

Almost surely, 2^1216011247 is an apocalyptic number.

1216011247 is a deficient number, since it is larger than the sum of its proper divisors (113859425).

1216011247 is a wasteful number, since it uses less digits than its factorization.

1216011247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276089.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1216011247 is about 34871.3528128749. The cubic root of 1216011247 is about 1067.3639502147.

Adding to 1216011247 its reverse (7421106121), we get a palindrome (8637117368).

The spelling of 1216011247 in words is "one billion, two hundred sixteen million, eleven thousand, two hundred forty-seven".