Search a number
-
+
13781131 = 713374093
BaseRepresentation
bin110100100100…
…100010001011
3221221011011021
4310210202023
512011444011
61211213311
7225065140
oct64444213
927834137
1013781131
117862a71
124747237
132b16920
141b8a3c7
151323471
hexd2488b

13781131 has 16 divisors (see below), whose sum is σ = 17424064. Its totient is φ = 10606464.

The previous prime is 13781129. The next prime is 13781149. The reversal of 13781131 is 13118731.

It is a cyclic number.

It is not a de Polignac number, because 13781131 - 21 = 13781129 is a prime.

It is a super-2 number, since 2×137811312 = 379839143278322, which contains 22 as substring.

It is a deceptive number, since it divides R13781130.

It is a junction number, because it is equal to n+sod(n) for n = 13781096 and 13781105.

It is not an unprimeable number, because it can be changed into a prime (13781731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1321 + ... + 5413.

It is an arithmetic number, because the mean of its divisors is an integer number (1089004).

Almost surely, 213781131 is an apocalyptic number.

13781131 is a deficient number, since it is larger than the sum of its proper divisors (3642933).

13781131 is a wasteful number, since it uses less digits than its factorization.

13781131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150.

The product of its digits is 504, while the sum is 25.

The square root of 13781131 is about 3712.2945734411. The cubic root of 13781131 is about 239.7516586252.

Adding to 13781131 its reverse (13118731), we get a palindrome (26899862).

The spelling of 13781131 in words is "thirteen million, seven hundred eighty-one thousand, one hundred thirty-one".

Divisors: 1 7 13 37 91 259 481 3367 4093 28651 53209 151441 372463 1060087 1968733 13781131