61718 has 4 divisors (see below), whose sum is σ = 92580. Its totient is φ = 30858.

The previous prime is 61717. The next prime is 61723. The reversal of 61718 is 81716.

61718 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.

It is a super-2 number, since 2×61718² = 7618223048, which contains 22 as substring.

It is an Ulam number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 61693 and 61702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15428 + ... + 15431.

It is an arithmetic number, because the mean of its divisors is an integer number (23145).

2⁶¹⁷¹⁸ is an apocalyptic number.

61718 is a deficient number, since it is larger than the sum of its proper divisors (30862).

61718 is a wasteful number, since it uses less digits than its factorization.

61718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30861.

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

The square root of 61718 is about 248.4310769610. The cubic root of 61718 is about 39.5188181445.

The spelling of 61718 in words is "sixty-one thousand, seven hundred eighteen".