191540947 has 8 divisors (see below), whose sum is σ = 207255440. Its totient is φ = 175966560.

The previous prime is 191540927. The next prime is 191540959. The reversal of 191540947 is 749045191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191540947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191540917) 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 7 ways as a sum of consecutive naturals, for example, 32172 + ... + 37657.

It is an arithmetic number, because the mean of its divisors is an integer number (25906930).

Almost surely, 2^191540947 is an apocalyptic number.

191540947 is a deficient number, since it is larger than the sum of its proper divisors (15714493).

191540947 is a wasteful number, since it uses less digits than its factorization.

191540947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70053.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 191540947 is about 13839.8318992681. The cubic root of 191540947 is about 576.4396910805.

It can be divided in two parts, 1915409 and 47, that added together give a square (1915456 = 1384²).

The spelling of 191540947 in words is "one hundred ninety-one million, five hundred forty thousand, nine hundred forty-seven".