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129079 = 294451
BaseRepresentation
bin11111100000110111
320120001201
4133200313
513112304
62433331
71045216
oct374067
9216051
10129079
1188a85
1262847
13469a2
143507d
15283a4
hex1f837

129079 has 4 divisors (see below), whose sum is σ = 133560. Its totient is φ = 124600.

The previous prime is 129061. The next prime is 129083. The reversal of 129079 is 970921.

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

It is a cyclic number.

It is not a de Polignac number, because 129079 - 27 = 128951 is a prime.

It is a super-2 number, since 2×1290792 = 33322776482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129049) 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 3 ways as a sum of consecutive naturals, for example, 2197 + ... + 2254.

It is an arithmetic number, because the mean of its divisors is an integer number (33390).

2129079 is an apocalyptic number.

129079 is a deficient number, since it is larger than the sum of its proper divisors (4481).

129079 is an equidigital number, since it uses as much as digits as its factorization.

129079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4480.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 129079 is about 359.2756601831. The cubic root of 129079 is about 50.5380558162.

It can be divided in two parts, 1290 and 79, that added together give a square (1369 = 372).

The spelling of 129079 in words is "one hundred twenty-nine thousand, seventy-nine".

Divisors: 1 29 4451 129079