191901 has 8 divisors (see below), whose sum is σ = 261504. Its totient is φ = 125120.

The previous prime is 191899. The next prime is 191903. The reversal of 191901 is 109191.

It is an interprime number because it is at equal distance from previous prime (191899) and next prime (191903).

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

It is a cyclic number.

It is not a de Polignac number, because 191901 - 2¹ = 191899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540 + ... + 821.

It is an arithmetic number, because the mean of its divisors is an integer number (32688).

2¹⁹¹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

191901 is a deficient number, since it is larger than the sum of its proper divisors (69603).

191901 is a wasteful number, since it uses less digits than its factorization.

191901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411.

The product of its (nonzero) digits is 81, while the sum is 21.

The square root of 191901 is about 438.0650636606. The cubic root of 191901 is about 57.6800656418.

It can be divided in two parts, 19190 and 1, that added together give a palindrome (19191).

The spelling of 191901 in words is "one hundred ninety-one thousand, nine hundred one".