1216512001 has 8 divisors (see below), whose sum is σ = 1224849024. Its totient is φ = 1208187840.

The previous prime is 1216511977. The next prime is 1216512029. The reversal of 1216512001 is 1002156121.

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 1216512001 - 2⁵ = 1216511969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216512001.

It is not an unprimeable number, because it can be changed into a prime (1216512701) 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, 255321 + ... + 260041.

It is an arithmetic number, because the mean of its divisors is an integer number (153106128).

Almost surely, 2^1216512001 is an apocalyptic number.

It is an amenable number.

1216512001 is a deficient number, since it is larger than the sum of its proper divisors (8337023).

1216512001 is a wasteful number, since it uses less digits than its factorization.

1216512001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6431.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1216512001 is about 34878.5320935386. The cubic root of 1216512001 is about 1067.5104437658.

Adding to 1216512001 its reverse (1002156121), we get a palindrome (2218668122).

The spelling of 1216512001 in words is "one billion, two hundred sixteen million, five hundred twelve thousand, one".