191019428 has 6 divisors (see below), whose sum is σ = 334284006. Its totient is φ = 95509712.

The previous prime is 191019401. The next prime is 191019431. The reversal of 191019428 is 824910191.

191019428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 173396224 + 17623204 = 13168^2 + 4198^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23877425 + ... + 23877432.

It is an arithmetic number, because the mean of its divisors is an integer number (55714001).

Almost surely, 2^191019428 is an apocalyptic number.

It is an amenable number.

191019428 is a deficient number, since it is larger than the sum of its proper divisors (143264578).

191019428 is a wasteful number, since it uses less digits than its factorization.

191019428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47754861 (or 47754859 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 191019428 is about 13820.9778235840. The cubic root of 191019428 is about 575.9160475960.

The spelling of 191019428 in words is "one hundred ninety-one million, nineteen thousand, four hundred twenty-eight".