191989141 has 4 divisors (see below), whose sum is σ = 192022272. Its totient is φ = 191956012.

The previous prime is 191989121. The next prime is 191989153. The reversal of 191989141 is 141989191.

191989141 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191989141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191989121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5335 + ... + 20308.

It is an arithmetic number, because the mean of its divisors is an integer number (48005568).

Almost surely, 2^191989141 is an apocalyptic number.

It is an amenable number.

191989141 is a deficient number, since it is larger than the sum of its proper divisors (33131).

191989141 is an equidigital number, since it uses as much as digits as its factorization.

191989141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33130.

The product of its digits is 23328, while the sum is 43.

The square root of 191989141 is about 13856.0146145997. The cubic root of 191989141 is about 576.8889519540. Note that the first 3 decimals are identical.

The spelling of 191989141 in words is "one hundred ninety-one million, nine hundred eighty-nine thousand, one hundred forty-one".