1329921191 has 2 divisors, whose sum is σ = 1329921192. Its totient is φ = 1329921190.

The previous prime is 1329921161. The next prime is 1329921217. The reversal of 1329921191 is 1911299231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1329921191 - 2³⁰ = 256179367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1329921161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664960595 + 664960596.

It is an arithmetic number, because the mean of its divisors is an integer number (664960596).

Almost surely, 2^1329921191 is an apocalyptic number.

1329921191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1329921191 is an equidigital number, since it uses as much as digits as its factorization.

1329921191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 38.

The square root of 1329921191 is about 36468.0845534832. The cubic root of 1329921191 is about 1099.7027271078.

The spelling of 1329921191 in words is "one billion, three hundred twenty-nine million, nine hundred twenty-one thousand, one hundred ninety-one".