51312523 has 4 divisors (see below), whose sum is σ = 51542848. Its totient is φ = 51082200.

The previous prime is 51312497. The next prime is 51312551. The reversal of 51312523 is 32521315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32521315 = 5 ⋅6504263.

It is a cyclic number.

It is not a de Polignac number, because 51312523 - 2¹⁷ = 51181451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51312494 and 51312503.

It is not an unprimeable number, because it can be changed into a prime (51312593) 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, 114828 + ... + 115273.

It is an arithmetic number, because the mean of its divisors is an integer number (12885712).

Almost surely, 2^51312523 is an apocalyptic number.

51312523 is a deficient number, since it is larger than the sum of its proper divisors (230325).

51312523 is a wasteful number, since it uses less digits than its factorization.

51312523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230324.

The product of its digits is 900, while the sum is 22.

The square root of 51312523 is about 7163.2759963581. The cubic root of 51312523 is about 371.5989313532.

Adding to 51312523 its reverse (32521315), we get a palindrome (83833838).

The spelling of 51312523 in words is "fifty-one million, three hundred twelve thousand, five hundred twenty-three".