633861 has 6 divisors (see below), whose sum is σ = 915590. Its totient is φ = 422568.

The previous prime is 633833. The next prime is 633877. The reversal of 633861 is 168336.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 93636 = 735^2 + 306^2 .

It is not a de Polignac number, because 633861 - 2⁶ = 633797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (633161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35206 + ... + 35223.

2⁶³³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

633861 is a deficient number, since it is larger than the sum of its proper divisors (281729).

633861 is a wasteful number, since it uses less digits than its factorization.

633861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70435 (or 70432 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 633861 is about 796.1538795987. The cubic root of 633861 is about 85.9009586353.

The spelling of 633861 in words is "six hundred thirty-three thousand, eight hundred sixty-one".