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13129806891 = 34376602297
BaseRepresentation
bin11000011101001100…
…01111010000101011
31020220001001022001010
430032212033100223
5203342212310031
610010505155003
7643240342245
oct141646172053
936801038033
1013129806891
115628485283
12266518ba63
131313250606
148c7ab9095
1551ca43246
hex30e98f42b

13129806891 has 4 divisors (see below), whose sum is σ = 17506409192. Its totient is φ = 8753204592.

The previous prime is 13129806883. The next prime is 13129806947. The reversal of 13129806891 is 19860892131.

13129806891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13129806891 - 23 = 13129806883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13129806891.

It is not an unprimeable number, because it can be changed into a prime (13129806091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2188301146 + ... + 2188301151.

It is an arithmetic number, because the mean of its divisors is an integer number (4376602298).

Almost surely, 213129806891 is an apocalyptic number.

13129806891 is a deficient number, since it is larger than the sum of its proper divisors (4376602301).

13129806891 is an equidigital number, since it uses as much as digits as its factorization.

13129806891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4376602300.

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 13129806891 in words is "thirteen billion, one hundred twenty-nine million, eight hundred six thousand, eight hundred ninety-one".

Divisors: 1 3 4376602297 13129806891