261461 has 4 divisors (see below), whose sum is σ = 267072. Its totient is φ = 255852.

The previous prime is 261451. The next prime is 261463. The reversal of 261461 is 164162.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261461 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 4.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261463) 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, 2735 + ... + 2828.

It is an arithmetic number, because the mean of its divisors is an integer number (66768).

2²⁶¹⁴⁶¹ is an apocalyptic number.

It is an amenable number.

261461 is a deficient number, since it is larger than the sum of its proper divisors (5611).

261461 is an equidigital number, since it uses as much as digits as its factorization.

261461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5610.

The product of its digits is 288, while the sum is 20.

The square root of 261461 is about 511.3325727939. The cubic root of 261461 is about 63.9443689753.

The spelling of 261461 in words is "two hundred sixty-one thousand, four hundred sixty-one".