1216283331 has 8 divisors (see below), whose sum is σ = 1648296784. Its totient is φ = 797562720.

The previous prime is 1216283329. The next prime is 1216283353. The reversal of 1216283331 is 1333826121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216283331 - 2¹ = 1216283329 is a prime.

It is a super-2 number, since 2×1216283331² = 2958690282536911122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216283311) 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, 3322996 + ... + 3323361.

It is an arithmetic number, because the mean of its divisors is an integer number (206037098).

Almost surely, 2^1216283331 is an apocalyptic number.

1216283331 is a deficient number, since it is larger than the sum of its proper divisors (432013453).

1216283331 is an equidigital number, since it uses as much as digits as its factorization.

1216283331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6646421.

The product of its digits is 5184, while the sum is 30.

The square root of 1216283331 is about 34875.2538485385. The cubic root of 1216283331 is about 1067.4435522734.

The spelling of 1216283331 in words is "one billion, two hundred sixteen million, two hundred eighty-three thousand, three hundred thirty-one".