1245845197 has 4 divisors (see below), whose sum is σ = 1248293340. Its totient is φ = 1243397056.

The previous prime is 1245845179. The next prime is 1245845203. The reversal of 1245845197 is 7915485421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7915485421 = 4591 ⋅1724131.

It can be written as a sum of positive squares in 2 ways, for example, as 1046781316 + 199063881 = 32354^2 + 14109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245845197 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 (1245845177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1223308 + ... + 1224325.

It is an arithmetic number, because the mean of its divisors is an integer number (312073335).

Almost surely, 2^1245845197 is an apocalyptic number.

It is an amenable number.

1245845197 is a deficient number, since it is larger than the sum of its proper divisors (2448143).

1245845197 is an equidigital number, since it uses as much as digits as its factorization.

1245845197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448142.

The product of its digits is 403200, while the sum is 46.

The square root of 1245845197 is about 35296.5323650922. The cubic root of 1245845197 is about 1076.0225200047.

The spelling of 1245845197 in words is "one billion, two hundred forty-five million, eight hundred forty-five thousand, one hundred ninety-seven".