228091697 has 4 divisors (see below), whose sum is σ = 228196980. Its totient is φ = 227986416.

The previous prime is 228091693. The next prime is 228091709. The reversal of 228091697 is 796190822.

It is a happy number.

228091697 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 can be written as a sum of positive squares in 2 ways, for example, as 215531761 + 12559936 = 14681^2 + 3544^2 .

It is a cyclic number.

It is not a de Polignac number, because 228091697 - 2² = 228091693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228091693) 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, 49322 + ... + 53747.

It is an arithmetic number, because the mean of its divisors is an integer number (57049245).

Almost surely, 2^228091697 is an apocalyptic number.

It is an amenable number.

228091697 is a deficient number, since it is larger than the sum of its proper divisors (105283).

228091697 is a wasteful number, since it uses less digits than its factorization.

228091697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105282.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 228091697 is about 15102.7049563977. The cubic root of 228091697 is about 610.9933622086.

The spelling of 228091697 in words is "two hundred twenty-eight million, ninety-one thousand, six hundred ninety-seven".