191947131 has 16 divisors (see below), whose sum is σ = 285457920. Its totient is φ = 127473480.

The previous prime is 191947097. The next prime is 191947159. The reversal of 191947131 is 131749191.

It is not a de Polignac number, because 191947131 - 2¹⁰ = 191946107 is a prime.

It is a super-2 number, since 2×191947131² = 73687402198262322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191947181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6415 + ... + 20616.

It is an arithmetic number, because the mean of its divisors is an integer number (17841120).

Almost surely, 2^191947131 is an apocalyptic number.

191947131 is a deficient number, since it is larger than the sum of its proper divisors (93510789).

191947131 is a wasteful number, since it uses less digits than its factorization.

191947131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27303 (or 27297 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 191947131 is about 13854.4985834927. The cubic root of 191947131 is about 576.8468716699.

The spelling of 191947131 in words is "one hundred ninety-one million, nine hundred forty-seven thousand, one hundred thirty-one".