61771 has 4 divisors (see below), whose sum is σ = 62272. Its totient is φ = 61272.

The previous prime is 61757. The next prime is 61781. The reversal of 61771 is 17716.

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 is a cyclic number.

It is not a de Polignac number, because 61771 - 2⁷ = 61643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61751) 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, 85 + ... + 361.

It is an arithmetic number, because the mean of its divisors is an integer number (15568).

2⁶¹⁷⁷¹ is an apocalyptic number.

61771 is a deficient number, since it is larger than the sum of its proper divisors (501).

61771 is a wasteful number, since it uses less digits than its factorization.

61771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500.

The product of its digits is 294, while the sum is 22.

The square root of 61771 is about 248.5377234948. The cubic root of 61771 is about 39.5301270987.

The spelling of 61771 in words is "sixty-one thousand, seven hundred seventy-one".