1331112217 has 2 divisors, whose sum is σ = 1331112218. Its totient is φ = 1331112216.

The previous prime is 1331112187. The next prime is 1331112221. The reversal of 1331112217 is 7122111331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1163901456 + 167210761 = 34116^2 + 12931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331112217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331112227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665556108 + 665556109.

It is an arithmetic number, because the mean of its divisors is an integer number (665556109).

Almost surely, 2^1331112217 is an apocalyptic number.

It is an amenable number.

1331112217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331112217 is an equidigital number, since it uses as much as digits as its factorization.

1331112217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 22.

The square root of 1331112217 is about 36484.4106023381. The cubic root of 1331112217 is about 1100.0309129054.

Adding to 1331112217 its reverse (7122111331), we get a palindrome (8453223548).

The spelling of 1331112217 in words is "one billion, three hundred thirty-one million, one hundred twelve thousand, two hundred seventeen".