1997329331 has 2 divisors, whose sum is σ = 1997329332. Its totient is φ = 1997329330.

The previous prime is 1997329253. The next prime is 1997329333. The reversal of 1997329331 is 1339237991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1997329331 is a prime.

It is a super-2 number, since 2×1997329331² = 7978648912945815122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1997329333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1997329333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998664665 + 998664666.

It is an arithmetic number, because the mean of its divisors is an integer number (998664666).

Almost surely, 2^1997329331 is an apocalyptic number.

1997329331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997329331 is an equidigital number, since it uses as much as digits as its factorization.

1997329331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 47.

The square root of 1997329331 is about 44691.4905882540. The cubic root of 1997329331 is about 1259.3599947402.

The spelling of 1997329331 in words is "one billion, nine hundred ninety-seven million, three hundred twenty-nine thousand, three hundred thirty-one".