1331203217 has 2 divisors, whose sum is σ = 1331203218. Its totient is φ = 1331203216.

The previous prime is 1331203193. The next prime is 1331203261. The reversal of 1331203217 is 7123021331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 675792016 + 655411201 = 25996^2 + 25601^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331203217 - 2¹⁰ = 1331202193 is a prime.

It is a super-2 number, since 2×1331203217² = 3544204009902298178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1331203192 and 1331203201.

It is not a weakly prime, because it can be changed into another prime (1331203297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665601608 + 665601609.

It is an arithmetic number, because the mean of its divisors is an integer number (665601609).

Almost surely, 2^1331203217 is an apocalyptic number.

It is an amenable number.

1331203217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331203217 is an equidigital number, since it uses as much as digits as its factorization.

1331203217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 1331203217 is about 36485.6576890153. The cubic root of 1331203217 is about 1100.0559797957.

Adding to 1331203217 its reverse (7123021331), we get a palindrome (8454224548).

The spelling of 1331203217 in words is "one billion, three hundred thirty-one million, two hundred three thousand, two hundred seventeen".