245807197 has 4 divisors (see below), whose sum is σ = 246216796. Its totient is φ = 245397600.

The previous prime is 245807171. The next prime is 245807201. The reversal of 245807197 is 791708542.

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 231222436 + 14584761 = 15206^2 + 3819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245807197 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 (245807117) 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, 203898 + ... + 205099.

It is an arithmetic number, because the mean of its divisors is an integer number (61554199).

Almost surely, 2^245807197 is an apocalyptic number.

It is an amenable number.

245807197 is a deficient number, since it is larger than the sum of its proper divisors (409599).

245807197 is an equidigital number, since it uses as much as digits as its factorization.

245807197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409598.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 245807197 is about 15678.2396014348. The cubic root of 245807197 is about 626.4189176784.

The spelling of 245807197 in words is "two hundred forty-five million, eight hundred seven thousand, one hundred ninety-seven".