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649241 = 3891669
BaseRepresentation
bin10011110100000011001
31012222120222
42132200121
5131233431
621525425
75342555
oct2364031
91188528
10649241
1140386a
12273875
13199688
1412c865
15cc57b
hex9e819

649241 has 4 divisors (see below), whose sum is σ = 651300. Its totient is φ = 647184.

The previous prime is 649217. The next prime is 649261. The reversal of 649241 is 142946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 142946 = 271473.

It can be written as a sum of positive squares in 2 ways, for example, as 246016 + 403225 = 496^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 649241 - 210 = 648217 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 649241.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649261) 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, 446 + ... + 1223.

It is an arithmetic number, because the mean of its divisors is an integer number (162825).

2649241 is an apocalyptic number.

It is an amenable number.

649241 is a deficient number, since it is larger than the sum of its proper divisors (2059).

649241 is a wasteful number, since it uses less digits than its factorization.

649241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058.

The product of its digits is 1728, while the sum is 26.

The square root of 649241 is about 805.7549255202. The cubic root of 649241 is about 86.5901807107.

The spelling of 649241 in words is "six hundred forty-nine thousand, two hundred forty-one".

Divisors: 1 389 1669 649241