51321523 has 8 divisors (see below), whose sum is σ = 57793536. Its totient is φ = 45150600.

The previous prime is 51321511. The next prime is 51321539. The reversal of 51321523 is 32512315.

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

It is a de Polignac number, because none of the positive numbers 2^k-51321523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51321494 and 51321503.

It is not an unprimeable number, because it can be changed into a prime (51325523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74911 + ... + 75592.

It is an arithmetic number, because the mean of its divisors is an integer number (7224192).

Almost surely, 2^51321523 is an apocalyptic number.

51321523 is a deficient number, since it is larger than the sum of its proper divisors (6472013).

51321523 is a wasteful number, since it uses less digits than its factorization.

51321523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150545.

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

The square root of 51321523 is about 7163.9041730051. The cubic root of 51321523 is about 371.6206557113.

Adding to 51321523 its reverse (32512315), we get a palindrome (83833838).

The spelling of 51321523 in words is "fifty-one million, three hundred twenty-one thousand, five hundred twenty-three".