51511423 has 8 divisors (see below), whose sum is σ = 52569216. Its totient is φ = 50463000.

The previous prime is 51511417. The next prime is 51511459. The reversal of 51511423 is 32411515.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51511423 - 2⁹ = 51510911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51511394 and 51511403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9348 + ... + 13798.

It is an arithmetic number, because the mean of its divisors is an integer number (6571152).

Almost surely, 2^51511423 is an apocalyptic number.

51511423 is a deficient number, since it is larger than the sum of its proper divisors (1057793).

51511423 is a wasteful number, since it uses less digits than its factorization.

51511423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685.

The product of its digits is 600, while the sum is 22.

The square root of 51511423 is about 7177.1458811982. The cubic root of 51511423 is about 372.0784486921.

Adding to 51511423 its reverse (32411515), we get a palindrome (83922938).

The spelling of 51511423 in words is "fifty-one million, five hundred eleven thousand, four hundred twenty-three".