51423213 has 4 divisors (see below), whose sum is σ = 68564288. Its totient is φ = 34282140.

The previous prime is 51423209. The next prime is 51423247. The reversal of 51423213 is 31232415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51423213 - 2² = 51423209 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 51423213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51423263) 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, 8570533 + ... + 8570538.

It is an arithmetic number, because the mean of its divisors is an integer number (17141072).

Almost surely, 2^51423213 is an apocalyptic number.

It is an amenable number.

51423213 is a deficient number, since it is larger than the sum of its proper divisors (17141075).

51423213 is a wasteful number, since it uses less digits than its factorization.

51423213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17141074.

The product of its digits is 720, while the sum is 21.

The square root of 51423213 is about 7170.9980476918. The cubic root of 51423213 is about 371.8659405368.

Adding to 51423213 its reverse (31232415), we get a palindrome (82655628).

The spelling of 51423213 in words is "fifty-one million, four hundred twenty-three thousand, two hundred thirteen".