228781601 has 4 divisors (see below), whose sum is σ = 230104212. Its totient is φ = 227458992.

The previous prime is 228781589. The next prime is 228781607. The reversal of 228781601 is 106187822.

228781601 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 206209600 + 22572001 = 14360^2 + 4751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228781601 is a prime.

It is a super-2 number, since 2×228781601² = 104682041912246402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228781607) 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, 661046 + ... + 661391.

It is an arithmetic number, because the mean of its divisors is an integer number (57526053).

Almost surely, 2^228781601 is an apocalyptic number.

It is an amenable number.

228781601 is a deficient number, since it is larger than the sum of its proper divisors (1322611).

228781601 is a wasteful number, since it uses less digits than its factorization.

228781601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322610.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 228781601 is about 15125.5281230111. The cubic root of 228781601 is about 611.6087616123.

The spelling of 228781601 in words is "two hundred twenty-eight million, seven hundred eighty-one thousand, six hundred one".