51405423 has 4 divisors (see below), whose sum is σ = 68540568. Its totient is φ = 34270280.

The previous prime is 51405413. The next prime is 51405463. The reversal of 51405423 is 32450415.

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 51405423 - 2⁴ = 51405407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51405393 and 51405402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51405413) 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, 8567568 + ... + 8567573.

It is an arithmetic number, because the mean of its divisors is an integer number (17135142).

Almost surely, 2^51405423 is an apocalyptic number.

51405423 is a deficient number, since it is larger than the sum of its proper divisors (17135145).

51405423 is a wasteful number, since it uses less digits than its factorization.

51405423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17135144.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 51405423 is about 7169.7575272808. The cubic root of 51405423 is about 371.8230529138.

Adding to 51405423 its reverse (32450415), we get a palindrome (83855838).

The spelling of 51405423 in words is "fifty-one million, four hundred five thousand, four hundred twenty-three".