191961 has 24 divisors (see below), whose sum is σ = 346944. Its totient is φ = 99360.

The previous prime is 191953. The next prime is 191969. The reversal of 191961 is 169191.

It is an interprime number because it is at equal distance from previous prime (191953) and next prime (191969).

It is not a de Polignac number, because 191961 - 2³ = 191953 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191969) 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, 555 + ... + 831.

It is an arithmetic number, because the mean of its divisors is an integer number (14456).

2¹⁹¹⁹⁶¹ is an apocalyptic number.

191961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

191961 is a deficient number, since it is larger than the sum of its proper divisors (154983).

191961 is a wasteful number, since it uses less digits than its factorization.

191961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 298 counting only the distinct ones).

The product of its digits is 486, while the sum is 27.

The square root of 191961 is about 438.1335412862. The cubic root of 191961 is about 57.6860764552.

The spelling of 191961 in words is "one hundred ninety-one thousand, nine hundred sixty-one".