51822281 has 4 divisors (see below), whose sum is σ = 59225472. Its totient is φ = 44419092.

The previous prime is 51822263. The next prime is 51822283. The reversal of 51822281 is 18222815.

It is a happy number.

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 51822281 - 2¹⁸ = 51560137 is a prime.

It is a super-2 number, since 2×51822281² = 5371097616085922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51822283) 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, 3701585 + ... + 3701598.

It is an arithmetic number, because the mean of its divisors is an integer number (14806368).

Almost surely, 2^51822281 is an apocalyptic number.

It is an amenable number.

51822281 is a deficient number, since it is larger than the sum of its proper divisors (7403191).

51822281 is an equidigital number, since it uses as much as digits as its factorization.

51822281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7403190.

The product of its digits is 2560, while the sum is 29.

The square root of 51822281 is about 7198.7694087254. The cubic root of 51822281 is about 372.8254135796.

The spelling of 51822281 in words is "fifty-one million, eight hundred twenty-two thousand, two hundred eighty-one".