1216232151 has 4 divisors (see below), whose sum is σ = 1621642872. Its totient is φ = 810821432.

The previous prime is 1216232141. The next prime is 1216232183. The reversal of 1216232151 is 1512326121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1216232151 - 2¹⁷ = 1216101079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216232141) 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, 202705356 + ... + 202705361.

It is an arithmetic number, because the mean of its divisors is an integer number (405410718).

Almost surely, 2^1216232151 is an apocalyptic number.

1216232151 is a deficient number, since it is larger than the sum of its proper divisors (405410721).

1216232151 is an equidigital number, since it uses as much as digits as its factorization.

1216232151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405410720.

The product of its digits is 720, while the sum is 24.

The square root of 1216232151 is about 34874.5200827194. The cubic root of 1216232151 is about 1067.4285797403.

Adding to 1216232151 its reverse (1512326121), we get a palindrome (2728558272).

The spelling of 1216232151 in words is "one billion, two hundred sixteen million, two hundred thirty-two thousand, one hundred fifty-one".