228145091 has 2 divisors, whose sum is σ = 228145092. Its totient is φ = 228145090.

The previous prime is 228145061. The next prime is 228145111. The reversal of 228145091 is 190541822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228145091 - 2¹⁸ = 227882947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228145031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114072545 + 114072546.

It is an arithmetic number, because the mean of its divisors is an integer number (114072546).

Almost surely, 2^228145091 is an apocalyptic number.

228145091 is a deficient number, since it is larger than the sum of its proper divisors (1).

228145091 is an equidigital number, since it uses as much as digits as its factorization.

228145091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 228145091 is about 15104.4725495464. The cubic root of 228145091 is about 611.0410343141.

The spelling of 228145091 in words is "two hundred twenty-eight million, one hundred forty-five thousand, ninety-one".