1216030451 has 8 divisors (see below), whose sum is σ = 1287866160. Its totient is φ = 1144228608.

The previous prime is 1216030421. The next prime is 1216030471. The reversal of 1216030451 is 1540306121.

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-1216030451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216030421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138140 + ... + 146678.

It is an arithmetic number, because the mean of its divisors is an integer number (160983270).

Almost surely, 2^1216030451 is an apocalyptic number.

1216030451 is a deficient number, since it is larger than the sum of its proper divisors (71835709).

1216030451 is an equidigital number, since it uses as much as digits as its factorization.

1216030451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16933.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1216030451 is about 34871.6281667490. The cubic root of 1216030451 is about 1067.3695690086.

Adding to 1216030451 its reverse (1540306121), we get a palindrome (2756336572).

The spelling of 1216030451 in words is "one billion, two hundred sixteen million, thirty thousand, four hundred fifty-one".