191945855 has 8 divisors (see below), whose sum is σ = 232923600. Its totient is φ = 151830976.

The previous prime is 191945849. The next prime is 191945863. The reversal of 191945855 is 558549191.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 191945855 - 2¹² = 191941759 is a prime.

It is a super-2 number, since 2×191945855² = 73686422503362050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215225 + ... + 216114.

It is an arithmetic number, because the mean of its divisors is an integer number (29115450).

Almost surely, 2^191945855 is an apocalyptic number.

191945855 is a deficient number, since it is larger than the sum of its proper divisors (40977745).

191945855 is an equidigital number, since it uses as much as digits as its factorization.

191945855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431433.

The product of its digits is 324000, while the sum is 47.

The square root of 191945855 is about 13854.4525333916. The cubic root of 191945855 is about 576.8455934391.

It can be divided in two parts, 1919 and 45855, that added together give a palindrome (47774).

The spelling of 191945855 in words is "one hundred ninety-one million, nine hundred forty-five thousand, eight hundred fifty-five".