191028061 has 8 divisors (see below), whose sum is σ = 223642944. Its totient is φ = 159744480.

The previous prime is 191028049. The next prime is 191028073. The reversal of 191028061 is 160820191.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (191028049) and next prime (191028073).

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

It is not a de Polignac number, because 191028061 - 2¹¹ = 191026013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191028001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332515 + ... + 333088.

It is an arithmetic number, because the mean of its divisors is an integer number (27955368).

Almost surely, 2^191028061 is an apocalyptic number.

It is an amenable number.

191028061 is a deficient number, since it is larger than the sum of its proper divisors (32614883).

191028061 is an equidigital number, since it uses as much as digits as its factorization.

191028061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665651.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 191028061 is about 13821.2901351502. The cubic root of 191028061 is about 575.9247235169.

The spelling of 191028061 in words is "one hundred ninety-one million, twenty-eight thousand, sixty-one".