228521261 has 8 divisors (see below), whose sum is σ = 239452224. Its totient is φ = 217673280.

The previous prime is 228521231. The next prime is 228521263. The reversal of 228521261 is 162125822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228521261 - 2⁶ = 228521197 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 (228521263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15071 + ... + 26156.

It is an arithmetic number, because the mean of its divisors is an integer number (29931528).

Almost surely, 2^228521261 is an apocalyptic number.

It is an amenable number.

228521261 is a deficient number, since it is larger than the sum of its proper divisors (10930963).

228521261 is a wasteful number, since it uses less digits than its factorization.

228521261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41491.

The product of its digits is 3840, while the sum is 29.

The square root of 228521261 is about 15116.9196928475. The cubic root of 228521261 is about 611.3766819649.

The spelling of 228521261 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, two hundred sixty-one".