191920101 has 16 divisors (see below), whose sum is σ = 265340928. Its totient is φ = 123260400.

The previous prime is 191920087. The next prime is 191920103. The reversal of 191920101 is 101029191.

It is not a de Polignac number, because 191920101 - 2¹¹ = 191918053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191920103) 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 15 ways as a sum of consecutive naturals, for example, 16566 + ... + 25656.

It is an arithmetic number, because the mean of its divisors is an integer number (16583808).

Almost surely, 2^191920101 is an apocalyptic number.

It is an amenable number.

191920101 is a deficient number, since it is larger than the sum of its proper divisors (73420827).

191920101 is a wasteful number, since it uses less digits than its factorization.

191920101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9352.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 191920101 is about 13853.5230537217. The cubic root of 191920101 is about 576.8197932017.

Adding to 191920101 its reverse (101029191), we get a palindrome (292949292).

The spelling of 191920101 in words is "one hundred ninety-one million, nine hundred twenty thousand, one hundred one".