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86191431 = 330839319
BaseRepresentation
bin1010010001100…
…10110101000111
320000011222102020
411020302311013
5134031111211
612315214223
72064420654
oct510626507
9200158366
1086191431
114471a997
1224a47373
1314b1a561
14b638c2b
157878306
hex5232d47

86191431 has 8 divisors (see below), whose sum is σ = 114971520. Its totient is φ = 57436152.

The previous prime is 86191421. The next prime is 86191447. The reversal of 86191431 is 13419168.

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

It is not a de Polignac number, because 86191431 - 29 = 86190919 is a prime.

It is a super-2 number, since 2×861914312 = 14857925555655522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 86191392 and 86191401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86191421) 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 7 ways as a sum of consecutive naturals, for example, 4590 + ... + 13908.

It is an arithmetic number, because the mean of its divisors is an integer number (14371440).

Almost surely, 286191431 is an apocalyptic number.

86191431 is a deficient number, since it is larger than the sum of its proper divisors (28780089).

86191431 is a wasteful number, since it uses less digits than its factorization.

86191431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12405.

The product of its digits is 5184, while the sum is 33.

The square root of 86191431 is about 9283.9340260474. The cubic root of 86191431 is about 441.7277641517.

The spelling of 86191431 in words is "eighty-six million, one hundred ninety-one thousand, four hundred thirty-one".

Divisors: 1 3 3083 9249 9319 27957 28730477 86191431