51422213 has 4 divisors (see below), whose sum is σ = 51437100. Its totient is φ = 51407328.

The previous prime is 51422209. The next prime is 51422233. The reversal of 51422213 is 31222415.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 15984004 + 35438209 = 3998^2 + 5953^2 .

It is a cyclic number.

It is not a de Polignac number, because 51422213 - 2² = 51422209 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 (51422233) 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, 731 + ... + 10167.

It is an arithmetic number, because the mean of its divisors is an integer number (12859275).

Almost surely, 2^51422213 is an apocalyptic number.

It is an amenable number.

51422213 is a deficient number, since it is larger than the sum of its proper divisors (14887).

51422213 is an equidigital number, since it uses as much as digits as its factorization.

51422213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14886.

The product of its digits is 480, while the sum is 20.

The square root of 51422213 is about 7170.9283220515. The cubic root of 51422213 is about 371.8635300278.

Adding to 51422213 its reverse (31222415), we get a palindrome (82644628).

The spelling of 51422213 in words is "fifty-one million, four hundred twenty-two thousand, two hundred thirteen".