1321197311 has 4 divisors (see below), whose sum is σ = 1509939792. Its totient is φ = 1132454832.

The previous prime is 1321197299. The next prime is 1321197329. The reversal of 1321197311 is 1137911231.

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 1321197311 - 2⁶ = 1321197247 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 (1321197331) 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, 94371230 + ... + 94371243.

It is an arithmetic number, because the mean of its divisors is an integer number (377484948).

Almost surely, 2^1321197311 is an apocalyptic number.

1321197311 is a deficient number, since it is larger than the sum of its proper divisors (188742481).

1321197311 is an equidigital number, since it uses as much as digits as its factorization.

1321197311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188742480.

The product of its digits is 1134, while the sum is 29.

The square root of 1321197311 is about 36348.2779647124. The cubic root of 1321197311 is about 1097.2928778942.

The spelling of 1321197311 in words is "one billion, three hundred twenty-one million, one hundred ninety-seven thousand, three hundred eleven".