1329911491 has 4 divisors (see below), whose sum is σ = 1333261792. Its totient is φ = 1326561192.

The previous prime is 1329911489. The next prime is 1329911503. The reversal of 1329911491 is 1941199231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1329911491 - 2¹ = 1329911489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329911291) 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, 1674555 + ... + 1675348.

It is an arithmetic number, because the mean of its divisors is an integer number (333315448).

Almost surely, 2^1329911491 is an apocalyptic number.

1329911491 is a deficient number, since it is larger than the sum of its proper divisors (3350301).

1329911491 is an equidigital number, since it uses as much as digits as its factorization.

1329911491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3350300.

The product of its digits is 17496, while the sum is 40.

The square root of 1329911491 is about 36467.9515602398. The cubic root of 1329911491 is about 1099.7000534801.

The spelling of 1329911491 in words is "one billion, three hundred twenty-nine million, nine hundred eleven thousand, four hundred ninety-one".