61517 has 4 divisors (see below), whose sum is σ = 62016. Its totient is φ = 61020.

The previous prime is 61511. The next prime is 61519. The reversal of 61517 is 71516.

61517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61517 - 2⁸ = 61261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61511) 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, 92 + ... + 362.

It is an arithmetic number, because the mean of its divisors is an integer number (15504).

2⁶¹⁵¹⁷ is an apocalyptic number.

It is an amenable number.

61517 is a deficient number, since it is larger than the sum of its proper divisors (499).

61517 is a wasteful number, since it uses less digits than its factorization.

61517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498.

The product of its digits is 210, while the sum is 20.

The square root of 61517 is about 248.0262082926. The cubic root of 61517 is about 39.4758705378.

Subtracting 61517 from its reverse (71516), we obtain a palindrome (9999).

The spelling of 61517 in words is "sixty-one thousand, five hundred seventeen".