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289027561 = 1092651629
BaseRepresentation
bin10001001110100…
…011010111101001
3202010212010021111
4101032203113221
51042442340221
644402510321
710106456644
oct2116432751
9663763244
10289027561
1113916a759
12809653a1
1347b58734
142a558a5b
151a592be1
hex113a35e9

289027561 has 4 divisors (see below), whose sum is σ = 291679300. Its totient is φ = 286375824.

The previous prime is 289027549. The next prime is 289027631. The reversal of 289027561 is 165720982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131675625 + 157351936 = 11475^2 + 12544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-289027561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (289027261) 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, 1325706 + ... + 1325923.

It is an arithmetic number, because the mean of its divisors is an integer number (72919825).

Almost surely, 2289027561 is an apocalyptic number.

It is an amenable number.

289027561 is a deficient number, since it is larger than the sum of its proper divisors (2651739).

289027561 is a wasteful number, since it uses less digits than its factorization.

289027561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651738.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 289027561 is about 17000.8105983215. The cubic root of 289027561 is about 661.1699183921.

It can be divided in two parts, 28902 and 7561, that added together give a palindrome (36463).

The spelling of 289027561 in words is "two hundred eighty-nine million, twenty-seven thousand, five hundred sixty-one".

Divisors: 1 109 2651629 289027561