1216200351 has 4 divisors (see below), whose sum is σ = 1621600472. Its totient is φ = 810800232.

The previous prime is 1216200319. The next prime is 1216200361. The reversal of 1216200351 is 1530026121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1216200351 - 2⁵ = 1216200319 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 (1216200301) 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, 202700056 + ... + 202700061.

It is an arithmetic number, because the mean of its divisors is an integer number (405400118).

Almost surely, 2^1216200351 is an apocalyptic number.

1216200351 is a deficient number, since it is larger than the sum of its proper divisors (405400121).

1216200351 is an equidigital number, since it uses as much as digits as its factorization.

1216200351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405400120.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1216200351 is about 34874.0641594868. The cubic root of 1216200351 is about 1067.4192765480.

Adding to 1216200351 its reverse (1530026121), we get a palindrome (2746226472).

The spelling of 1216200351 in words is "one billion, two hundred sixteen million, two hundred thousand, three hundred fifty-one".