191147961 has 16 divisors (see below), whose sum is σ = 277531200. Its totient is φ = 116561088.

The previous prime is 191147951. The next prime is 191147977. The reversal of 191147961 is 169741191.

It is not a de Polignac number, because 191147961 - 2¹⁵ = 191115193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191147911) 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 15 ways as a sum of consecutive naturals, for example, 56166 + ... + 59471.

It is an arithmetic number, because the mean of its divisors is an integer number (17345700).

Almost surely, 2^191147961 is an apocalyptic number.

It is an amenable number.

191147961 is a deficient number, since it is larger than the sum of its proper divisors (86383239).

191147961 is a wasteful number, since it uses less digits than its factorization.

191147961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115688.

The product of its digits is 13608, while the sum is 39.

The square root of 191147961 is about 13825.6269658920. The cubic root of 191147961 is about 576.0451926106.

The spelling of 191147961 in words is "one hundred ninety-one million, one hundred forty-seven thousand, nine hundred sixty-one".