191275261 has 8 divisors (see below), whose sum is σ = 201782880. Its totient is φ = 180811728.

The previous prime is 191275247. The next prime is 191275267. The reversal of 191275261 is 162572191.

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 191275261 - 2⁵ = 191275229 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 (191275267) 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, 1906 + ... + 19651.

It is an arithmetic number, because the mean of its divisors is an integer number (25222860).

Almost surely, 2^191275261 is an apocalyptic number.

It is an amenable number.

191275261 is a deficient number, since it is larger than the sum of its proper divisors (10507619).

191275261 is a wasteful number, since it uses less digits than its factorization.

191275261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22043.

The product of its digits is 7560, while the sum is 34.

The square root of 191275261 is about 13830.2299691654. The cubic root of 191275261 is about 576.1730417034.

The spelling of 191275261 in words is "one hundred ninety-one million, two hundred seventy-five thousand, two hundred sixty-one".