228121711 has 2 divisors, whose sum is σ = 228121712. Its totient is φ = 228121710.

The previous prime is 228121693. The next prime is 228121727. The reversal of 228121711 is 117121822.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228121711 - 2¹³ = 228113519 is a prime.

It is a super-4 number, since 4×228121711⁴ (a number of 35 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228121741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114060855 + 114060856.

It is an arithmetic number, because the mean of its divisors is an integer number (114060856).

Almost surely, 2^228121711 is an apocalyptic number.

228121711 is a deficient number, since it is larger than the sum of its proper divisors (1).

228121711 is an equidigital number, since it uses as much as digits as its factorization.

228121711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 448, while the sum is 25.

The square root of 228121711 is about 15103.6985867701. The cubic root of 228121711 is about 611.0201607151.

The spelling of 228121711 in words is "two hundred twenty-eight million, one hundred twenty-one thousand, seven hundred eleven".