261773 has 2 divisors, whose sum is σ = 261774. Its totient is φ = 261772.

The previous prime is 261761. The next prime is 261787. The reversal of 261773 is 377162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170569 + 91204 = 413^2 + 302^2 .

It is a cyclic number.

It is not a de Polignac number, because 261773 - 2⁴ = 261757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130886 + 130887.

It is an arithmetic number, because the mean of its divisors is an integer number (130887).

2²⁶¹⁷⁷³ is an apocalyptic number.

It is an amenable number.

261773 is a deficient number, since it is larger than the sum of its proper divisors (1).

261773 is an equidigital number, since it uses as much as digits as its factorization.

261773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 26.

The square root of 261773 is about 511.6375670335. The cubic root of 261773 is about 63.9697936884.

The spelling of 261773 in words is "two hundred sixty-one thousand, seven hundred seventy-three".