1331216633 has 2 divisors, whose sum is σ = 1331216634. Its totient is φ = 1331216632.

The previous prime is 1331216611. The next prime is 1331216647. The reversal of 1331216633 is 3366121331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1320014224 + 11202409 = 36332^2 + 3347^2 .

It is an emirp because it is prime and its reverse (3366121331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331216633 - 2²⁴ = 1314439417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1331216596 and 1331216605.

It is not a weakly prime, because it can be changed into another prime (1331216683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665608316 + 665608317.

It is an arithmetic number, because the mean of its divisors is an integer number (665608317).

Almost surely, 2^1331216633 is an apocalyptic number.

It is an amenable number.

1331216633 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331216633 is an equidigital number, since it uses as much as digits as its factorization.

1331216633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 29.

The square root of 1331216633 is about 36485.8415416172. The cubic root of 1331216633 is about 1100.0596752749.

Adding to 1331216633 its reverse (3366121331), we get a palindrome (4697337964).

The spelling of 1331216633 in words is "one billion, three hundred thirty-one million, two hundred sixteen thousand, six hundred thirty-three".