1331216623 has 4 divisors (see below), whose sum is σ = 1452236328. Its totient is φ = 1210196920.

The previous prime is 1331216611. The next prime is 1331216633. The reversal of 1331216623 is 3266121331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331216623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331216591 and 1331216600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331216633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60509836 + ... + 60509857.

It is an arithmetic number, because the mean of its divisors is an integer number (363059082).

Almost surely, 2^1331216623 is an apocalyptic number.

1331216623 is a deficient number, since it is larger than the sum of its proper divisors (121019705).

1331216623 is a wasteful number, since it uses less digits than its factorization.

1331216623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121019704.

The product of its digits is 3888, while the sum is 28.

The square root of 1331216623 is about 36485.8414045777. The cubic root of 1331216623 is about 1100.0596725204.

Adding to 1331216623 its reverse (3266121331), we get a palindrome (4597337954).

The spelling of 1331216623 in words is "one billion, three hundred thirty-one million, two hundred sixteen thousand, six hundred twenty-three".