61261 has 2 divisors, whose sum is σ = 61262. Its totient is φ = 61260.

The previous prime is 61253. The next prime is 61283. The reversal of 61261 is 16216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44100 + 17161 = 210^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 61261 - 2³ = 61253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30630 + 30631.

It is an arithmetic number, because the mean of its divisors is an integer number (30631).

2⁶¹²⁶¹ is an apocalyptic number.

It is an amenable number.

61261 is a deficient number, since it is larger than the sum of its proper divisors (1).

61261 is an equidigital number, since it uses as much as digits as its factorization.

61261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 61261 is about 247.5095957736. The cubic root of 61261 is about 39.4210354317.

Adding to 61261 its reverse (16216), we get a palindrome (77477).

The spelling of 61261 in words is "sixty-one thousand, two hundred sixty-one".