61081 has 4 divisors (see below), whose sum is σ = 64692. Its totient is φ = 57472.

The previous prime is 61057. The next prime is 61091. The reversal of 61081 is 18016.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33856 + 27225 = 184^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 61081 - 2⁷ = 60953 is a prime.

It is a super-2 number, since 2×61081² = 7461777122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a zygodrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (61001) 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, 1780 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (16173).

2⁶¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

61081 is a deficient number, since it is larger than the sum of its proper divisors (3611).

61081 is a wasteful number, since it uses less digits than its factorization.

61081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 61081 is about 247.1457060117. The cubic root of 61081 is about 39.3823879645.

Adding to 61081 its reverse (18016), we get a palindrome (79097).

The spelling of 61081 in words is "sixty-one thousand, eighty-one".