636161797 has 4 divisors (see below), whose sum is σ = 636254316. Its totient is φ = 636069280.

The previous prime is 636161789. The next prime is 636161803. The reversal of 636161797 is 797161636.

636161797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 394856641 + 241305156 = 19871^2 + 15534^2 .

It is a cyclic number.

It is not a de Polignac number, because 636161797 - 2³ = 636161789 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 (636161707) 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, 35038 + ... + 49999.

It is an arithmetic number, because the mean of its divisors is an integer number (159063579).

Almost surely, 2^636161797 is an apocalyptic number.

It is an amenable number.

636161797 is a deficient number, since it is larger than the sum of its proper divisors (92519).

636161797 is an equidigital number, since it uses as much as digits as its factorization.

636161797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92518.

The product of its digits is 285768, while the sum is 46.

The square root of 636161797 is about 25222.2480560318. The cubic root of 636161797 is about 860.0476794369.

The spelling of 636161797 in words is "six hundred thirty-six million, one hundred sixty-one thousand, seven hundred ninety-seven".