1320561231 has 8 divisors (see below), whose sum is σ = 1920816384. Its totient is φ = 800340120.

The previous prime is 1320561227. The next prime is 1320561233. The reversal of 1320561231 is 1321650231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1320561231 - 2² = 1320561227 is a prime.

It is a super-2 number, since 2×1320561231² = 3487763929640470722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320561233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20008471 + ... + 20008536.

It is an arithmetic number, because the mean of its divisors is an integer number (240102048).

Almost surely, 2^1320561231 is an apocalyptic number.

1320561231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1320561231 is a deficient number, since it is larger than the sum of its proper divisors (600255153).

1320561231 is a wasteful number, since it uses less digits than its factorization.

1320561231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40017021.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1320561231 is about 36339.5271158005. The cubic root of 1320561231 is about 1097.1167552999.

The spelling of 1320561231 in words is "one billion, three hundred twenty million, five hundred sixty-one thousand, two hundred thirty-one".