228609691 has 4 divisors (see below), whose sum is σ = 240641800. Its totient is φ = 216577584.

The previous prime is 228609677. The next prime is 228609701. The reversal of 228609691 is 196906822.

228609691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 228609691 - 2¹⁵ = 228576923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228609611) 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, 6016026 + ... + 6016063.

It is an arithmetic number, because the mean of its divisors is an integer number (60160450).

Almost surely, 2^228609691 is an apocalyptic number.

228609691 is a deficient number, since it is larger than the sum of its proper divisors (12032109).

228609691 is a wasteful number, since it uses less digits than its factorization.

228609691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12032108.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 228609691 is about 15119.8442782986. The cubic root of 228609691 is about 611.4555324952.

The spelling of 228609691 in words is "two hundred twenty-eight million, six hundred nine thousand, six hundred ninety-one".