1320506197 has 4 divisors (see below), whose sum is σ = 1321054956. Its totient is φ = 1319957440.

The previous prime is 1320506123. The next prime is 1320506203. The reversal of 1320506197 is 7916050231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7916050231 = 23 ⋅344176097.

It can be written as a sum of positive squares in 2 ways, for example, as 1001026321 + 319479876 = 31639^2 + 17874^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320506197 - 2²³ = 1312117589 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 (1320506497) 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 3 ways as a sum of consecutive naturals, for example, 270754 + ... + 275587.

It is an arithmetic number, because the mean of its divisors is an integer number (330263739).

Almost surely, 2^1320506197 is an apocalyptic number.

It is an amenable number.

1320506197 is a deficient number, since it is larger than the sum of its proper divisors (548759).

1320506197 is an equidigital number, since it uses as much as digits as its factorization.

1320506197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548758.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 1320506197 is about 36338.7698883713. The cubic root of 1320506197 is about 1097.1015144157.

The spelling of 1320506197 in words is "one billion, three hundred twenty million, five hundred six thousand, one hundred ninety-seven".