191940261 has 16 divisors (see below), whose sum is σ = 275658240. Its totient is φ = 118404720.

The previous prime is 191940257. The next prime is 191940317. The reversal of 191940261 is 162049191.

191940261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191940261 - 2² = 191940257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191940211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36705 + ... + 41606.

It is an arithmetic number, because the mean of its divisors is an integer number (17228640).

Almost surely, 2^191940261 is an apocalyptic number.

It is an amenable number.

191940261 is a deficient number, since it is larger than the sum of its proper divisors (83717979).

191940261 is a wasteful number, since it uses less digits than its factorization.

191940261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78376.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 191940261 is about 13854.2506473645. The cubic root of 191940261 is about 576.8399895921.

The spelling of 191940261 in words is "one hundred ninety-one million, nine hundred forty thousand, two hundred sixty-one".