51663823 has 4 divisors (see below), whose sum is σ = 52175448. Its totient is φ = 51152200.

The previous prime is 51663791. The next prime is 51663847. The reversal of 51663823 is 32836615.

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

It is a cyclic number.

It is not a de Polignac number, because 51663823 - 2⁵ = 51663791 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 (51663853) 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, 255661 + ... + 255862.

It is an arithmetic number, because the mean of its divisors is an integer number (13043862).

Almost surely, 2^51663823 is an apocalyptic number.

51663823 is a deficient number, since it is larger than the sum of its proper divisors (511625).

51663823 is a wasteful number, since it uses less digits than its factorization.

51663823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511624.

The product of its digits is 25920, while the sum is 34.

The square root of 51663823 is about 7187.7550737348. The cubic root of 51663823 is about 372.4450270962.

The spelling of 51663823 in words is "fifty-one million, six hundred sixty-three thousand, eight hundred twenty-three".