291230228 has 24 divisors (see below), whose sum is σ = 522510912. Its totient is φ = 141954624.

The previous prime is 291230221. The next prime is 291230239. The reversal of 291230228 is 822032192.

It is a self number, because there is not a number n which added to its sum of digits gives 291230228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291230221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109976 + ... + 112592.

It is an arithmetic number, because the mean of its divisors is an integer number (21771288).

Almost surely, 2^291230228 is an apocalyptic number.

It is an amenable number.

291230228 is a deficient number, since it is larger than the sum of its proper divisors (231280684).

291230228 is a wasteful number, since it uses less digits than its factorization.

291230228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311 (or 3309 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 291230228 is about 17065.4688772386. The cubic root of 291230228 is about 662.8452524886.

The spelling of 291230228 in words is "two hundred ninety-one million, two hundred thirty thousand, two hundred twenty-eight".