191551085 has 16 divisors (see below), whose sum is σ = 256096512. Its totient is φ = 136344000.

The previous prime is 191551067. The next prime is 191551117. The reversal of 191551085 is 580155191.

It is not a de Polignac number, because 191551085 - 2¹⁰ = 191550061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 34466 + ... + 39635.

It is an arithmetic number, because the mean of its divisors is an integer number (16006032).

Almost surely, 2^191551085 is an apocalyptic number.

It is an amenable number.

191551085 is a deficient number, since it is larger than the sum of its proper divisors (64545427).

191551085 is a wasteful number, since it uses less digits than its factorization.

191551085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74164.

The product of its (nonzero) digits is 9000, while the sum is 35.

The square root of 191551085 is about 13840.1981560959. The cubic root of 191551085 is about 576.4498609556.

The spelling of 191551085 in words is "one hundred ninety-one million, five hundred fifty-one thousand, eighty-five".