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139231 = 375371
BaseRepresentation
bin100001111111011111
321001222201
4201333133
513423411
62552331
71116631
oct417737
9231881
10139231
1195674
12686a7
134b4b1
1438a51
152b3c1
hex21fdf

139231 has 8 divisors (see below), whose sum is σ = 147744. Its totient is φ = 131040.

The previous prime is 139201. The next prime is 139241. The reversal of 139231 is 132931.

It can be divided in two parts, 13923 and 1, that added together give a square (13924 = 1182).

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

It is a 5-Lehmer number, since φ(139231) divides (139231-1)5.

It is a cyclic number.

It is not a de Polignac number, because 139231 - 25 = 139199 is a prime.

It is a super-2 number, since 2×1392312 = 38770542722, which contains 22 as substring.

It is a deceptive number, since it divides R139230.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139199 and 139208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139201) 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, 1926 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (18468).

2139231 is an apocalyptic number.

139231 is a deficient number, since it is larger than the sum of its proper divisors (8513).

139231 is an equidigital number, since it uses as much as digits as its factorization.

139231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161.

The product of its digits is 162, while the sum is 19.

The square root of 139231 is about 373.1367041715. The cubic root of 139231 is about 51.8296943185.

The spelling of 139231 in words is "one hundred thirty-nine thousand, two hundred thirty-one".

Divisors: 1 37 53 71 1961 2627 3763 139231