1329621797 has 4 divisors (see below), whose sum is σ = 1519567776. Its totient is φ = 1139675820.

The previous prime is 1329621793. The next prime is 1329621803. The reversal of 1329621797 is 7971269231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1329621797 - 2² = 1329621793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329621793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94972979 + ... + 94972992.

It is an arithmetic number, because the mean of its divisors is an integer number (379891944).

Almost surely, 2^1329621797 is an apocalyptic number.

It is an amenable number.

1329621797 is a deficient number, since it is larger than the sum of its proper divisors (189945979).

1329621797 is an equidigital number, since it uses as much as digits as its factorization.

1329621797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189945978.

The product of its digits is 285768, while the sum is 47.

The square root of 1329621797 is about 36463.9794454747. The cubic root of 1329621797 is about 1099.6201986316.

The spelling of 1329621797 in words is "one billion, three hundred twenty-nine million, six hundred twenty-one thousand, seven hundred ninety-seven".