859949191 has 4 divisors (see below), whose sum is σ = 860044000. Its totient is φ = 859854384.

The previous prime is 859949183. The next prime is 859949197. The reversal of 859949191 is 191949958.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 859949191 - 2³ = 859949183 is a prime.

It is a super-2 number, since 2×859949191² = 1479025222203108962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859949197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32166 + ... + 52483.

It is an arithmetic number, because the mean of its divisors is an integer number (215011000).

Almost surely, 2^859949191 is an apocalyptic number.

859949191 is a deficient number, since it is larger than the sum of its proper divisors (94809).

859949191 is a wasteful number, since it uses less digits than its factorization.

859949191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94808.

The product of its digits is 1049760, while the sum is 55.

The square root of 859949191 is about 29324.8902981750. The cubic root of 859949191 is about 950.9498131228.

The spelling of 859949191 in words is "eight hundred fifty-nine million, nine hundred forty-nine thousand, one hundred ninety-one".