191090241 has 6 divisors (see below), whose sum is σ = 276019250. Its totient is φ = 127393488.

The previous prime is 191090227. The next prime is 191090243. The reversal of 191090241 is 142090191.

191090241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 164865600 + 26224641 = 12840^2 + 5121^2 .

It is not a de Polignac number, because 191090241 - 2¹⁸ = 190828097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191090243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10616116 + ... + 10616133.

Almost surely, 2^191090241 is an apocalyptic number.

It is an amenable number.

191090241 is a deficient number, since it is larger than the sum of its proper divisors (84929009).

191090241 is a wasteful number, since it uses less digits than its factorization.

191090241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21232255 (or 21232252 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 191090241 is about 13823.5393803468. The cubic root of 191090241 is about 575.9872049386.

Subtracting from 191090241 its reverse (142090191), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 191090241 in words is "one hundred ninety-one million, ninety thousand, two hundred forty-one".