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13121131 = 47279173
BaseRepresentation
bin110010000011…
…011001101011
3220200121210211
4302003121223
511324334011
61145121551
7216346012
oct62033153
926617724
1013121131
117452111
1244892b7
1329453aa
141a57a79
151242b21
hexc8366b

13121131 has 4 divisors (see below), whose sum is σ = 13400352. Its totient is φ = 12841912.

The previous prime is 13121117. The next prime is 13121159. The reversal of 13121131 is 13112131.

13121131 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, and also an emirpimes, since its reverse is a distinct semiprime: 13112131 = 40932059.

It is a cyclic number.

It is not a de Polignac number, because 13121131 - 25 = 13121099 is a prime.

It is a super-2 number, since 2×131211312 = 344328157438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121231) 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, 139540 + ... + 139633.

It is an arithmetic number, because the mean of its divisors is an integer number (3350088).

Almost surely, 213121131 is an apocalyptic number.

13121131 is a deficient number, since it is larger than the sum of its proper divisors (279221).

13121131 is an equidigital number, since it uses as much as digits as its factorization.

13121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279220.

The product of its digits is 18, while the sum is 13.

The square root of 13121131 is about 3622.3101744605. The cubic root of 13121131 is about 235.8615186326.

Adding to 13121131 its reverse (13112131), we get a palindrome (26233262).

The spelling of 13121131 in words is "thirteen million, one hundred twenty-one thousand, one hundred thirty-one".

Divisors: 1 47 279173 13121131