228193291 has 2 divisors, whose sum is σ = 228193292. Its totient is φ = 228193290.

The previous prime is 228193279. The next prime is 228193313. The reversal of 228193291 is 192391822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228193291 - 2⁹ = 228192779 is a prime.

It is a Chen prime.

It is equal to p_12548665 and since 228193291 and 12548665 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228193291.

It is not a weakly prime, because it can be changed into another prime (228193271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114096645 + 114096646.

It is an arithmetic number, because the mean of its divisors is an integer number (114096646).

Almost surely, 2^228193291 is an apocalyptic number.

228193291 is a deficient number, since it is larger than the sum of its proper divisors (1).

228193291 is an equidigital number, since it uses as much as digits as its factorization.

228193291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 228193291 is about 15106.0680191769. The cubic root of 228193291 is about 611.0840626400.

It can be divided in two parts, 228193 and 291, that added together give a square (228484 = 478²).

The spelling of 228193291 in words is "two hundred twenty-eight million, one hundred ninety-three thousand, two hundred ninety-one".