51319823 has 4 divisors (see below), whose sum is σ = 52571568. Its totient is φ = 50068080.

The previous prime is 51319819. The next prime is 51319841. The reversal of 51319823 is 32891315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32891315 = 5 ⋅6578263.

It is a cyclic number.

It is not a de Polignac number, because 51319823 - 2² = 51319819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51319823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51319883) 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, 625811 + ... + 625892.

It is an arithmetic number, because the mean of its divisors is an integer number (13142892).

Almost surely, 2^51319823 is an apocalyptic number.

51319823 is a deficient number, since it is larger than the sum of its proper divisors (1251745).

51319823 is a wasteful number, since it uses less digits than its factorization.

51319823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251744.

The product of its digits is 6480, while the sum is 32.

The square root of 51319823 is about 7163.7855216359. The cubic root of 51319823 is about 371.6165524160.

The spelling of 51319823 in words is "fifty-one million, three hundred nineteen thousand, eight hundred twenty-three".