1331229997 has 2 divisors, whose sum is σ = 1331229998. Its totient is φ = 1331229996.

The previous prime is 1331229941. The next prime is 1331230009. The reversal of 1331229997 is 7999221331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1163423881 + 167806116 = 34109^2 + 12954^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331229997 - 2¹⁹ = 1330705709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331229917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665614998 + 665614999.

It is an arithmetic number, because the mean of its divisors is an integer number (665614999).

Almost surely, 2^1331229997 is an apocalyptic number.

It is an amenable number.

1331229997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331229997 is an equidigital number, since it uses as much as digits as its factorization.

1331229997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 46.

The square root of 1331229997 is about 36486.0246806911. The cubic root of 1331229997 is about 1100.0633564059.

The spelling of 1331229997 in words is "one billion, three hundred thirty-one million, two hundred twenty-nine thousand, nine hundred ninety-seven".