228175421 has 2 divisors, whose sum is σ = 228175422. Its totient is φ = 228175420.

The previous prime is 228175399. The next prime is 228175457. The reversal of 228175421 is 124571822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147355321 + 80820100 = 12139^2 + 8990^2 .

It is a cyclic number.

It is not a de Polignac number, because 228175421 - 2²⁶ = 161066557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228175481) 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, 114087710 + 114087711.

It is an arithmetic number, because the mean of its divisors is an integer number (114087711).

Almost surely, 2^228175421 is an apocalyptic number.

It is an amenable number.

228175421 is a deficient number, since it is larger than the sum of its proper divisors (1).

228175421 is an equidigital number, since it uses as much as digits as its factorization.

228175421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 228175421 is about 15105.4765234335. The cubic root of 228175421 is about 611.0681107289.

The spelling of 228175421 in words is "two hundred twenty-eight million, one hundred seventy-five thousand, four hundred twenty-one".