Search a number
-
+
13491985 = 513207569
BaseRepresentation
bin110011011101…
…111100010001
3221101110112011
4303131330101
511423220420
61201102521
7222452143
oct63357421
927343464
1013491985
117685801
124627a41
132a45130
141b12c93
1512b795a
hexcddf11

13491985 has 8 divisors (see below), whose sum is σ = 17435880. Its totient is φ = 9963264.

The previous prime is 13491983. The next prime is 13491997. The reversal of 13491985 is 58919431.

It can be written as a sum of positive squares in 4 ways, for example, as 118336 + 13373649 = 344^2 + 3657^2 .

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 13491985 - 21 = 13491983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13491983) 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, 103720 + ... + 103849.

It is an arithmetic number, because the mean of its divisors is an integer number (2179485).

Almost surely, 213491985 is an apocalyptic number.

It is an amenable number.

13491985 is a deficient number, since it is larger than the sum of its proper divisors (3943895).

13491985 is a wasteful number, since it uses less digits than its factorization.

13491985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207587.

The product of its digits is 38880, while the sum is 40.

The square root of 13491985 is about 3673.1437488887. The cubic root of 13491985 is about 238.0630261724.

The spelling of 13491985 in words is "thirteen million, four hundred ninety-one thousand, nine hundred eighty-five".

Divisors: 1 5 13 65 207569 1037845 2698397 13491985