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71001 = 327323
BaseRepresentation
bin10001010101011001
310121101200
4101111121
54233001
61304413
7414000
oct212531
9117350
1071001
1149387
1235109
1326418
141bc37
1516086
hex11559

71001 has 24 divisors (see below), whose sum is σ = 124800. Its totient is φ = 38808.

The previous prime is 70999. The next prime is 71011. The reversal of 71001 is 10017.

Adding to 71001 its reverse (10017), we get a palindrome (81018).

It can be divided in two parts, 7 and 1001, that multiplied together give a palindrome (7007).

It is not a de Polignac number, because 71001 - 21 = 70999 is a prime.

It is a super-2 number, since 2×710012 = 10082284002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3076 + ... + 3098.

It is an arithmetic number, because the mean of its divisors is an integer number (5200).

271001 is an apocalyptic number.

It is an amenable number.

71001 is a deficient number, since it is larger than the sum of its proper divisors (53799).

71001 is a wasteful number, since it uses less digits than its factorization.

71001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 7, while the sum is 9.

The square root of 71001 is about 266.4601283494. The cubic root of 71001 is about 41.4083718979.

The spelling of 71001 in words is "seventy-one thousand, one", and thus it is an iban number.

Divisors: 1 3 7 9 21 23 49 63 69 147 161 207 343 441 483 1029 1127 1449 3087 3381 7889 10143 23667 71001