51440227 has 4 divisors (see below), whose sum is σ = 51503256. Its totient is φ = 51377200.

The previous prime is 51440203. The next prime is 51440237. The reversal of 51440227 is 72204415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72204415 = 5 ⋅14440883.

It is a cyclic number.

It is not a de Polignac number, because 51440227 - 2⁷ = 51440099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51440237) 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, 30274 + ... + 31927.

It is an arithmetic number, because the mean of its divisors is an integer number (12875814).

Almost surely, 2^51440227 is an apocalyptic number.

51440227 is a deficient number, since it is larger than the sum of its proper divisors (63029).

51440227 is an equidigital number, since it uses as much as digits as its factorization.

51440227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63028.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 51440227 is about 7172.1842558596. The cubic root of 51440227 is about 371.9069481485.

The spelling of 51440227 in words is "fifty-one million, four hundred forty thousand, two hundred twenty-seven".