1183231997 has 4 divisors (see below), whose sum is σ = 1212091356. Its totient is φ = 1154372640.

The previous prime is 1183231939. The next prime is 1183232021. The reversal of 1183231997 is 7991323811.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16736281 + 1166495716 = 4091^2 + 34154^2 .

It is a cyclic number.

It is not a de Polignac number, because 1183231997 - 2⁸ = 1183231741 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 (1183231937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14429618 + ... + 14429699.

It is an arithmetic number, because the mean of its divisors is an integer number (303022839).

Almost surely, 2^1183231997 is an apocalyptic number.

It is an amenable number.

1183231997 is a deficient number, since it is larger than the sum of its proper divisors (28859359).

1183231997 is an equidigital number, since it uses as much as digits as its factorization.

1183231997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28859358.

The product of its digits is 81648, while the sum is 44.

The square root of 1183231997 is about 34398.1394409640. The cubic root of 1183231997 is about 1057.6857059011.

The spelling of 1183231997 in words is "one billion, one hundred eighty-three million, two hundred thirty-one thousand, nine hundred ninety-seven".