261373 has 4 divisors (see below), whose sum is σ = 298720. Its totient is φ = 224028.

The previous prime is 261353. The next prime is 261379. The reversal of 261373 is 373162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 373162 = 2 ⋅186581.

It is not a de Polignac number, because 261373 - 2⁹ = 260861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261379) 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, 18663 + ... + 18676.

It is an arithmetic number, because the mean of its divisors is an integer number (74680).

2²⁶¹³⁷³ is an apocalyptic number.

It is an amenable number.

261373 is a deficient number, since it is larger than the sum of its proper divisors (37347).

261373 is an equidigital number, since it uses as much as digits as its factorization.

261373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37346.

The product of its digits is 756, while the sum is 22.

The square root of 261373 is about 511.2465158805. The cubic root of 261373 is about 63.9371942457.

The spelling of 261373 in words is "two hundred sixty-one thousand, three hundred seventy-three".