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81513 = 333019
BaseRepresentation
bin10011111001101001
311010211000
4103321221
510102023
61425213
7456435
oct237151
9133730
1081513
1156273
123b209
132b143
14219c5
1519243
hex13e69

81513 has 8 divisors (see below), whose sum is σ = 120800. Its totient is φ = 54324.

The previous prime is 81509. The next prime is 81517. The reversal of 81513 is 31518.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81509) and next prime (81517).

It is not a de Polignac number, because 81513 - 22 = 81509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81517) 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, 1483 + ... + 1536.

It is an arithmetic number, because the mean of its divisors is an integer number (15100).

281513 is an apocalyptic number.

It is an amenable number.

81513 is a deficient number, since it is larger than the sum of its proper divisors (39287).

81513 is a wasteful number, since it uses less digits than its factorization.

81513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028 (or 3022 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 81513 is about 285.5048160715. The cubic root of 81513 is about 43.3586374235.

It can be divided in two parts, 815 and 13, that added together give a palindrome (828).

The spelling of 81513 in words is "eighty-one thousand, five hundred thirteen".

Divisors: 1 3 9 27 3019 9057 27171 81513