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142191 = 3273761
BaseRepresentation
bin100010101101101111
321020001100
4202231233
514022231
63014143
71131360
oct425557
9236040
10142191
1197915
126a353
134c94a
1439b67
152c1e6
hex22b6f

142191 has 24 divisors (see below), whose sum is σ = 245024. Its totient is φ = 77760.

The previous prime is 142189. The next prime is 142193. The reversal of 142191 is 191241.

It can be divided in two parts, 142 and 191, that added together give a palindrome (333).

It is an interprime number because it is at equal distance from previous prime (142189) and next prime (142193).

It is not a de Polignac number, because 142191 - 21 = 142189 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 (142193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2301 + ... + 2361.

2142191 is an apocalyptic number.

142191 is a deficient number, since it is larger than the sum of its proper divisors (102833).

142191 is a wasteful number, since it uses less digits than its factorization.

142191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 108 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 142191 is about 377.0822191512. The cubic root of 142191 is about 52.1944152214.

The spelling of 142191 in words is "one hundred forty-two thousand, one hundred ninety-one".

Divisors: 1 3 7 9 21 37 61 63 111 183 259 333 427 549 777 1281 2257 2331 3843 6771 15799 20313 47397 142191