228394921 has 2 divisors, whose sum is σ = 228394922. Its totient is φ = 228394920.

The previous prime is 228394897. The next prime is 228394937. The reversal of 228394921 is 129493822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134304921 + 94090000 = 11589^2 + 9700^2 .

It is a cyclic number.

It is not a de Polignac number, because 228394921 - 2⁵ = 228394889 is a prime.

It is not a weakly prime, because it can be changed into another prime (228394961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114197460 + 114197461.

It is an arithmetic number, because the mean of its divisors is an integer number (114197461).

Almost surely, 2^228394921 is an apocalyptic number.

It is an amenable number.

228394921 is a deficient number, since it is larger than the sum of its proper divisors (1).

228394921 is an equidigital number, since it uses as much as digits as its factorization.

228394921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 228394921 is about 15112.7403537545. The cubic root of 228394921 is about 611.2639928602.

The spelling of 228394921 in words is "two hundred twenty-eight million, three hundred ninety-four thousand, nine hundred twenty-one".