228191161 has 8 divisors (see below), whose sum is σ = 249885504. Its totient is φ = 206655120.

The previous prime is 228191149. The next prime is 228191209. The reversal of 228191161 is 161191822.

It is a happy number.

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 228191161 - 2¹⁵ = 228158393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228191141) 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, 36546 + ... + 42331.

It is an arithmetic number, because the mean of its divisors is an integer number (31235688).

Almost surely, 2^228191161 is an apocalyptic number.

It is an amenable number.

228191161 is a deficient number, since it is larger than the sum of its proper divisors (21694343).

228191161 is a wasteful number, since it uses less digits than its factorization.

228191161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79151.

The product of its digits is 1728, while the sum is 31.

The square root of 228191161 is about 15105.9975175425. The cubic root of 228191161 is about 611.0821613087.

The spelling of 228191161 in words is "two hundred twenty-eight million, one hundred ninety-one thousand, one hundred sixty-one".