1329931247 has 2 divisors, whose sum is σ = 1329931248. Its totient is φ = 1329931246.

The previous prime is 1329931243. The next prime is 1329931249. The reversal of 1329931247 is 7421399231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1329931247 - 2² = 1329931243 is a prime.

Together with 1329931249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1329931243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664965623 + 664965624.

It is an arithmetic number, because the mean of its divisors is an integer number (664965624).

Almost surely, 2^1329931247 is an apocalyptic number.

1329931247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1329931247 is an equidigital number, since it uses as much as digits as its factorization.

1329931247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 1329931247 is about 36468.2224272037. Note that the first 3 decimals coincide. The cubic root of 1329931247 is about 1099.7054988467.

The spelling of 1329931247 in words is "one billion, three hundred twenty-nine million, nine hundred thirty-one thousand, two hundred forty-seven".