51523423 has 4 divisors (see below), whose sum is σ = 58883920. Its totient is φ = 44162928.

The previous prime is 51523403. The next prime is 51523463. The reversal of 51523423 is 32432515.

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-51523423 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 (51523403) 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, 3680238 + ... + 3680251.

It is an arithmetic number, because the mean of its divisors is an integer number (14720980).

Almost surely, 2^51523423 is an apocalyptic number.

51523423 is a deficient number, since it is larger than the sum of its proper divisors (7360497).

51523423 is an equidigital number, since it uses as much as digits as its factorization.

51523423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7360496.

The product of its digits is 3600, while the sum is 25.

The square root of 51523423 is about 7177.9818194253. The cubic root of 51523423 is about 372.1073393372.

Adding to 51523423 its reverse (32432515), we get a palindrome (83955938).

The spelling of 51523423 in words is "fifty-one million, five hundred twenty-three thousand, four hundred twenty-three".