191082820 has 12 divisors (see below), whose sum is σ = 401273964. Its totient is φ = 76433120.

The previous prime is 191082779. The next prime is 191082821. The reversal of 191082820 is 28280191.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 32171584 + 158911236 = 5672^2 + 12606^2 .

It is not an unprimeable number, because it can be changed into a prime (191082821) 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 3 ways as a sum of consecutive naturals, for example, 4777051 + ... + 4777090.

It is an arithmetic number, because the mean of its divisors is an integer number (33439497).

Almost surely, 2^191082820 is an apocalyptic number.

191082820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191082820 is an abundant number, since it is smaller than the sum of its proper divisors (210191144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191082820 is a wasteful number, since it uses less digits than its factorization.

191082820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9554150 (or 9554148 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 191082820 is about 13823.2709587854. The cubic root of 191082820 is about 575.9797486771.

The spelling of 191082820 in words is "one hundred ninety-one million, eighty-two thousand, eight hundred twenty".