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261001 = 13171181
BaseRepresentation
bin111111101110001001
3111021000201
4333232021
531323001
65332201
72134636
oct775611
9437021
10261001
11169104
12107061
1391a50
146b18d
1552501
hex3fb89

261001 has 8 divisors (see below), whose sum is σ = 297864. Its totient is φ = 226560.

The previous prime is 260999. The next prime is 261011. The reversal of 261001 is 100162.

It can be written as a sum of positive squares in 4 ways, for example, as 81225 + 179776 = 285^2 + 424^2 .

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 261001 - 21 = 260999 is a prime.

It is a super-3 number, since 3×2610013 = 53339356091349003, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261011) 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, 370 + ... + 811.

It is an arithmetic number, because the mean of its divisors is an integer number (37233).

2261001 is an apocalyptic number.

It is an amenable number.

261001 is a deficient number, since it is larger than the sum of its proper divisors (36863).

261001 is a wasteful number, since it uses less digits than its factorization.

261001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 261001 is about 510.8825696772. The cubic root of 261001 is about 63.9068469017.

Adding to 261001 its reverse (100162), we get a palindrome (361163).

The spelling of 261001 in words is "two hundred sixty-one thousand, one".

Divisors: 1 13 17 221 1181 15353 20077 261001