51398219 has 2 divisors, whose sum is σ = 51398220. Its totient is φ = 51398218.

The previous prime is 51398209. The next prime is 51398227. The reversal of 51398219 is 91289315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51398219 - 2⁴ = 51398203 is a prime.

It is a super-2 number, since 2×51398219² = 5283553832743922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51398209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25699109 + 25699110.

It is an arithmetic number, because the mean of its divisors is an integer number (25699110).

Almost surely, 2^51398219 is an apocalyptic number.

51398219 is a deficient number, since it is larger than the sum of its proper divisors (1).

51398219 is an equidigital number, since it uses as much as digits as its factorization.

51398219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 38.

The square root of 51398219 is about 7169.2551216985. The cubic root of 51398219 is about 371.8056829020.

The spelling of 51398219 in words is "fifty-one million, three hundred ninety-eight thousand, two hundred nineteen".