228746591 has 4 divisors (see below), whose sum is σ = 229658184. Its totient is φ = 227835000.

The previous prime is 228746579. The next prime is 228746641. The reversal of 228746591 is 195647822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195647822 = 2 ⋅97823911.

It is a cyclic number.

It is not a de Polignac number, because 228746591 - 2⁶ = 228746527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228746521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455420 + ... + 455921.

It is an arithmetic number, because the mean of its divisors is an integer number (57414546).

Almost surely, 2^228746591 is an apocalyptic number.

228746591 is a deficient number, since it is larger than the sum of its proper divisors (911593).

228746591 is an equidigital number, since it uses as much as digits as its factorization.

228746591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911592.

The product of its digits is 241920, while the sum is 44.

The square root of 228746591 is about 15124.3707637706. The cubic root of 228746591 is about 611.5775622575.

The spelling of 228746591 in words is "two hundred twenty-eight million, seven hundred forty-six thousand, five hundred ninety-one".