61817 has 4 divisors (see below), whose sum is σ = 70656. Its totient is φ = 52980.

The previous prime is 61813. The next prime is 61819. The reversal of 61817 is 71816.

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.

It is a cyclic number.

It is not a de Polignac number, because 61817 - 2² = 61813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61792 and 61801.

It is not an unprimeable number, because it can be changed into a prime (61813) 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, 4409 + ... + 4422.

It is an arithmetic number, because the mean of its divisors is an integer number (17664).

2⁶¹⁸¹⁷ is an apocalyptic number.

It is an amenable number.

61817 is a deficient number, since it is larger than the sum of its proper divisors (8839).

61817 is an equidigital number, since it uses as much as digits as its factorization.

61817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8838.

The product of its digits is 336, while the sum is 23.

The square root of 61817 is about 248.6302475565. The cubic root of 61817 is about 39.5399371749.

Subtracting 61817 from its reverse (71816), we obtain a palindrome (9999).

It can be divided in two parts, 61 and 817, that added together give a palindrome (878).

The spelling of 61817 in words is "sixty-one thousand, eight hundred seventeen".