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61513 = 137449
BaseRepresentation
bin1111000001001001
310010101021
433001021
53432023
61152441
7344224
oct170111
9103337
1061513
1142241
122b721
1321cca
14185bb
151335d
hexf049

61513 has 4 divisors (see below), whose sum is σ = 62100. Its totient is φ = 60928.

The previous prime is 61511. The next prime is 61519. The reversal of 61513 is 31516.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 36864 + 24649 = 192^2 + 157^2 .

It is a cyclic number.

It is not a de Polignac number, because 61513 - 21 = 61511 is a prime.

It is a Duffinian number.

61513 is a lucky number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (61511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88 + ... + 361.

It is an arithmetic number, because the mean of its divisors is an integer number (15525).

261513 is an apocalyptic number.

It is an amenable number.

61513 is a deficient number, since it is larger than the sum of its proper divisors (587).

61513 is a wasteful number, since it uses less digits than its factorization.

61513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586.

The product of its digits is 90, while the sum is 16.

The square root of 61513 is about 248.0181444975. The cubic root of 61513 is about 39.4750149103.

The spelling of 61513 in words is "sixty-one thousand, five hundred thirteen".

Divisors: 1 137 449 61513