51798281 has 4 divisors (see below), whose sum is σ = 51820692. Its totient is φ = 51775872.

The previous prime is 51798247. The next prime is 51798287. The reversal of 51798281 is 18289715.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47045881 + 4752400 = 6859^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 51798281 - 2¹⁰ = 51797257 is a prime.

It is a super-2 number, since 2×51798281² = 5366123829109922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51798287) 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, 7280 + ... + 12513.

It is an arithmetic number, because the mean of its divisors is an integer number (12955173).

Almost surely, 2^51798281 is an apocalyptic number.

It is an amenable number.

51798281 is a deficient number, since it is larger than the sum of its proper divisors (22411).

51798281 is a wasteful number, since it uses less digits than its factorization.

51798281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22410.

The product of its digits is 40320, while the sum is 41.

The square root of 51798281 is about 7197.1022641060. The cubic root of 51798281 is about 372.7678502341.

The spelling of 51798281 in words is "fifty-one million, seven hundred ninety-eight thousand, two hundred eighty-one".