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129031 = 718433
BaseRepresentation
bin11111100000000111
320112222221
4133200013
513112111
62433211
71045120
oct374007
9215887
10129031
1188a41
1262807
1346966
1435047
1528371
hex1f807

129031 has 4 divisors (see below), whose sum is σ = 147472. Its totient is φ = 110592.

The previous prime is 129023. The next prime is 129037. The reversal of 129031 is 130921.

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

It is a 12-Lehmer number, since φ(129031) divides (129031-1)12.

It is a cyclic number.

It is not a de Polignac number, because 129031 - 23 = 129023 is a prime.

It is a super-2 number, since 2×1290312 = 33297997922, which contains 22 as substring.

It is a Duffinian number.

129031 is a lucky number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 128996 and 129014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9210 + ... + 9223.

It is an arithmetic number, because the mean of its divisors is an integer number (36868).

2129031 is an apocalyptic number.

129031 is a deficient number, since it is larger than the sum of its proper divisors (18441).

129031 is an equidigital number, since it uses as much as digits as its factorization.

129031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18440.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 129031 is about 359.2088528976. The cubic root of 129031 is about 50.5317905899.

Adding to 129031 its reverse (130921), we get a palindrome (259952).

The spelling of 129031 in words is "one hundred twenty-nine thousand, thirty-one".

Divisors: 1 7 18433 129031