228021719 has 2 divisors, whose sum is σ = 228021720. Its totient is φ = 228021718.

The previous prime is 228021671. The next prime is 228021749. The reversal of 228021719 is 917120822.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228021719 - 2⁸ = 228021463 is a prime.

It is a super-2 number, since 2×228021719² = 103987808671429922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228021749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114010859 + 114010860.

It is an arithmetic number, because the mean of its divisors is an integer number (114010860).

Almost surely, 2^228021719 is an apocalyptic number.

228021719 is a deficient number, since it is larger than the sum of its proper divisors (1).

228021719 is an equidigital number, since it uses as much as digits as its factorization.

228021719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 228021719 is about 15100.3880413717. The cubic root of 228021719 is about 610.9308720386.

The spelling of 228021719 in words is "two hundred twenty-eight million, twenty-one thousand, seven hundred nineteen".