191061 has 24 divisors (see below), whose sum is σ = 314496. Its totient is φ = 110880.

The previous prime is 191057. The next prime is 191071. The reversal of 191061 is 160191.

191061 = T₁₀₈ + T₁₀₉ + ... + T₁₃₃.

It is not a de Polignac number, because 191061 - 2² = 191057 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2656 + ... + 2726.

It is an arithmetic number, because the mean of its divisors is an integer number (13104).

2¹⁹¹⁰⁶¹ is an apocalyptic number.

191061 is the 234-th nonagonal number.

It is an amenable number.

191061 is a deficient number, since it is larger than the sum of its proper divisors (123435).

191061 is a wasteful number, since it uses less digits than its factorization.

191061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 191061 is about 437.1052504832. The cubic root of 191061 is about 57.5957823879.

The spelling of 191061 in words is "one hundred ninety-one thousand, sixty-one".