1216453601 has 16 divisors (see below), whose sum is σ = 1387266048. Its totient is φ = 1055854800.

The previous prime is 1216453591. The next prime is 1216453607. The reversal of 1216453601 is 1063546121.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1216453601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216453607) 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 15 ways as a sum of consecutive naturals, for example, 144416 + ... + 152606.

It is an arithmetic number, because the mean of its divisors is an integer number (86704128).

Almost surely, 2^1216453601 is an apocalyptic number.

1216453601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1216453601 is a deficient number, since it is larger than the sum of its proper divisors (170812447).

1216453601 is a wasteful number, since it uses less digits than its factorization.

1216453601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8812.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1216453601 is about 34877.6948922947. The cubic root of 1216453601 is about 1067.4933611538.

Adding to 1216453601 its reverse (1063546121), we get a palindrome (2279999722).

The spelling of 1216453601 in words is "one billion, two hundred sixteen million, four hundred fifty-three thousand, six hundred one".