51779219 has 2 divisors, whose sum is σ = 51779220. Its totient is φ = 51779218.

The previous prime is 51779209. The next prime is 51779227. The reversal of 51779219 is 91297715.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51779219 - 2¹² = 51775123 is a prime.

It is a super-2 number, since 2×51779219² = 5362175040499922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (51779209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25889609 + 25889610.

It is an arithmetic number, because the mean of its divisors is an integer number (25889610).

Almost surely, 2^51779219 is an apocalyptic number.

51779219 is a deficient number, since it is larger than the sum of its proper divisors (1).

51779219 is an equidigital number, since it uses as much as digits as its factorization.

51779219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39690, while the sum is 41.

The square root of 51779219 is about 7195.7778592728. Note that the first 3 decimals coincide. The cubic root of 51779219 is about 372.7221178762.

The spelling of 51779219 in words is "fifty-one million, seven hundred seventy-nine thousand, two hundred nineteen".