191161071 has 12 divisors (see below), whose sum is σ = 290654520. Its totient is φ = 120733200.

The previous prime is 191161057. The next prime is 191161177. The reversal of 191161071 is 170161191.

It is not a de Polignac number, because 191161071 - 2¹⁹ = 190636783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191161031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 558780 + ... + 559121.

It is an arithmetic number, because the mean of its divisors is an integer number (24221210).

Almost surely, 2^191161071 is an apocalyptic number.

191161071 is a deficient number, since it is larger than the sum of its proper divisors (99493449).

191161071 is a wasteful number, since it uses less digits than its factorization.

191161071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117926 (or 1117923 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 27.

The square root of 191161071 is about 13826.1010773103. The cubic root of 191161071 is about 576.0583617803.

The spelling of 191161071 in words is "one hundred ninety-one million, one hundred sixty-one thousand, seventy-one".