1320120231 has 4 divisors (see below), whose sum is σ = 1760160312. Its totient is φ = 880080152.

The previous prime is 1320120199. The next prime is 1320120233. The reversal of 1320120231 is 1320210231.

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 1320120231 - 2⁵ = 1320120199 is a prime.

It is a super-2 number, since 2×1320120231² = 3485434848590986722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1320120231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320120233) 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, 220020036 + ... + 220020041.

It is an arithmetic number, because the mean of its divisors is an integer number (440040078).

Almost surely, 2^1320120231 is an apocalyptic number.

1320120231 is a deficient number, since it is larger than the sum of its proper divisors (440040081).

1320120231 is an equidigital number, since it uses as much as digits as its factorization.

1320120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440040080.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1320120231 is about 36333.4588361747. The cubic root of 1320120231 is about 1096.9946147166.

Adding to 1320120231 its reverse (1320210231), we get a palindrome (2640330462).

Subtracting 1320120231 from its reverse (1320210231), we obtain a square (90000 = 300²).

The spelling of 1320120231 in words is "one billion, three hundred twenty million, one hundred twenty thousand, two hundred thirty-one".