261453 has 4 divisors (see below), whose sum is σ = 348608. Its totient is φ = 174300.

The previous prime is 261451. The next prime is 261463. The reversal of 261453 is 354162.

It is a happy number.

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.

It is not a de Polignac number, because 261453 - 2¹ = 261451 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 6² + 4⁶ + 1 + 5⁷ + 3¹¹ .

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261451) 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 in 3 ways as a sum of consecutive naturals, for example, 43573 + ... + 43578.

It is an arithmetic number, because the mean of its divisors is an integer number (87152).

2²⁶¹⁴⁵³ is an apocalyptic number.

It is an amenable number.

261453 is a deficient number, since it is larger than the sum of its proper divisors (87155).

261453 is an equidigital number, since it uses as much as digits as its factorization.

261453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87154.

The product of its digits is 720, while the sum is 21.

The square root of 261453 is about 511.3247500366. The cubic root of 261453 is about 63.9437167937.

The spelling of 261453 in words is "two hundred sixty-one thousand, four hundred fifty-three".