51398227 has 2 divisors, whose sum is σ = 51398228. Its totient is φ = 51398226.

The previous prime is 51398219. The next prime is 51398233. The reversal of 51398227 is 72289315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51398227 - 2³ = 51398219 is a prime.

It is not a weakly prime, because it can be changed into another prime (51398267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25699113 + 25699114.

It is an arithmetic number, because the mean of its divisors is an integer number (25699114).

Almost surely, 2^51398227 is an apocalyptic number.

51398227 is a deficient number, since it is larger than the sum of its proper divisors (1).

51398227 is an equidigital number, since it uses as much as digits as its factorization.

51398227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 51398227 is about 7169.2556796365. The cubic root of 51398227 is about 371.8057021922.

It can be divided in two parts, 5139 and 8227, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 51398227 in words is "fifty-one million, three hundred ninety-eight thousand, two hundred twenty-seven".