633138823 has 4 divisors (see below), whose sum is σ = 653562688. Its totient is φ = 612714960.

The previous prime is 633138797. The next prime is 633138827. The reversal of 633138823 is 328831336.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-633138823 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 (633138827) 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, 10211886 + ... + 10211947.

It is an arithmetic number, because the mean of its divisors is an integer number (163390672).

Almost surely, 2^633138823 is an apocalyptic number.

633138823 is a deficient number, since it is larger than the sum of its proper divisors (20423865).

633138823 is a wasteful number, since it uses less digits than its factorization.

633138823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20423864.

The product of its digits is 62208, while the sum is 37.

The square root of 633138823 is about 25162.2499590160. The cubic root of 633138823 is about 858.6832305155.

It can be divided in two parts, 6331 and 38823, that added together give a palindrome (45154).

The spelling of 633138823 in words is "six hundred thirty-three million, one hundred thirty-eight thousand, eight hundred twenty-three".