51842213 has 4 divisors (see below), whose sum is σ = 51999168. Its totient is φ = 51685260.

The previous prime is 51842209. The next prime is 51842221. The reversal of 51842213 is 31224815.

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 a cyclic number.

It is not a de Polignac number, because 51842213 - 2² = 51842209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51841213) 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, 77981 + ... + 78642.

It is an arithmetic number, because the mean of its divisors is an integer number (12999792).

Almost surely, 2^51842213 is an apocalyptic number.

It is an amenable number.

51842213 is a deficient number, since it is larger than the sum of its proper divisors (156955).

51842213 is a wasteful number, since it uses less digits than its factorization.

51842213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156954.

The product of its digits is 1920, while the sum is 26.

The square root of 51842213 is about 7200.1536789155. The cubic root of 51842213 is about 372.8732064303.

The spelling of 51842213 in words is "fifty-one million, eight hundred forty-two thousand, two hundred thirteen".