191213228 has 12 divisors (see below), whose sum is σ = 335522880. Its totient is φ = 95349552.

The previous prime is 191213227. The next prime is 191213257. The reversal of 191213228 is 822312191.

It is a self number, because there is not a number n which added to its sum of digits gives 191213228.

It is not an unprimeable number, because it can be changed into a prime (191213227) 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, 62588 + ... + 65571.

It is an arithmetic number, because the mean of its divisors is an integer number (27960240).

Almost surely, 2^191213228 is an apocalyptic number.

It is an amenable number.

191213228 is a deficient number, since it is larger than the sum of its proper divisors (144309652).

191213228 is a wasteful number, since it uses less digits than its factorization.

191213228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128536 (or 128534 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 191213228 is about 13827.9871275613. The cubic root of 191213228 is about 576.1107482201.

The spelling of 191213228 in words is "one hundred ninety-one million, two hundred thirteen thousand, two hundred twenty-eight".