228373091 has 2 divisors, whose sum is σ = 228373092. Its totient is φ = 228373090.

The previous prime is 228373073. The next prime is 228373097. The reversal of 228373091 is 190373822.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228373091 is a prime.

It is a Sophie Germain prime.

It is equal to p_12557960 and since 228373091 and 12557960 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (228373097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114186545 + 114186546.

It is an arithmetic number, because the mean of its divisors is an integer number (114186546).

Almost surely, 2^228373091 is an apocalyptic number.

228373091 is a deficient number, since it is larger than the sum of its proper divisors (1).

228373091 is an equidigital number, since it uses as much as digits as its factorization.

228373091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 228373091 is about 15112.0180981893. The cubic root of 228373091 is about 611.2445173569.

The spelling of 228373091 in words is "two hundred twenty-eight million, three hundred seventy-three thousand, ninety-one".