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12680581 = 193121529
BaseRepresentation
bin110000010111…
…110110000101
3212212020111011
4300113312011
511221234311
61131442221
7212532424
oct60276605
925766434
1012680581
117181121
1242b6371
13281ca04
1419812bb
1511a7321
hexc17d85

12680581 has 8 divisors (see below), whose sum is σ = 13779200. Its totient is φ = 11625120.

The previous prime is 12680579. The next prime is 12680587. The reversal of 12680581 is 18508621.

12680581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12680581 - 21 = 12680579 is a prime.

It is a super-2 number, since 2×126805812 = 321594268995122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12680587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10176 + ... + 11353.

It is an arithmetic number, because the mean of its divisors is an integer number (1722400).

Almost surely, 212680581 is an apocalyptic number.

It is an amenable number.

12680581 is a deficient number, since it is larger than the sum of its proper divisors (1098619).

12680581 is a wasteful number, since it uses less digits than its factorization.

12680581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21579.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 12680581 is about 3560.9803425461. The cubic root of 12680581 is about 233.1916797811.

The spelling of 12680581 in words is "twelve million, six hundred eighty thousand, five hundred eighty-one".

Divisors: 1 19 31 589 21529 409051 667399 12680581