635161 has 4 divisors (see below), whose sum is σ = 637732. Its totient is φ = 632592.

The previous prime is 635149. The next prime is 635197. The reversal of 635161 is 161536.

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 145161 + 490000 = 381^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 635161 - 2⁹ = 634649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (635461) 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, 870 + ... + 1423.

It is an arithmetic number, because the mean of its divisors is an integer number (159433).

2⁶³⁵¹⁶¹ is an apocalyptic number.

It is an amenable number.

635161 is a deficient number, since it is larger than the sum of its proper divisors (2571).

635161 is a wasteful number, since it uses less digits than its factorization.

635161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570.

The product of its digits is 540, while the sum is 22.

The square root of 635161 is about 796.9698865076. The cubic root of 635161 is about 85.9596439465.

Adding to 635161 its reverse (161536), we get a palindrome (796697).

The spelling of 635161 in words is "six hundred thirty-five thousand, one hundred sixty-one".