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191285071 = 1711252063
BaseRepresentation
bin10110110011011…
…00011101001111
3111022221021210021
423121230131033
5342432110241
630551523011
74511616265
oct1331543517
9438837707
10191285071
1198a8033a
1254089467
1330825643
141b594435
1511bd70d1
hexb66c74f

191285071 has 4 divisors (see below), whose sum is σ = 202537152. Its totient is φ = 180032992.

The previous prime is 191285063. The next prime is 191285161. The reversal of 191285071 is 170582191.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 191285071 - 23 = 191285063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191285041) 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 3 ways as a sum of consecutive naturals, for example, 5626015 + ... + 5626048.

It is an arithmetic number, because the mean of its divisors is an integer number (50634288).

Almost surely, 2191285071 is an apocalyptic number.

191285071 is a deficient number, since it is larger than the sum of its proper divisors (11252081).

191285071 is a wasteful number, since it uses less digits than its factorization.

191285071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11252080.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 191285071 is about 13830.5846224952. The cubic root of 191285071 is about 576.1828916632.

The spelling of 191285071 in words is "one hundred ninety-one million, two hundred eighty-five thousand, seventy-one".

Divisors: 1 17 11252063 191285071