261449 has 4 divisors (see below), whose sum is σ = 266436. Its totient is φ = 256464.

The previous prime is 261439. The next prime is 261451. The reversal of 261449 is 944162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135424 + 126025 = 368^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 261449 - 2⁴ = 261433 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (261439) 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, 2414 + ... + 2519.

It is an arithmetic number, because the mean of its divisors is an integer number (66609).

2²⁶¹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

261449 is a deficient number, since it is larger than the sum of its proper divisors (4987).

261449 is an equidigital number, since it uses as much as digits as its factorization.

261449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4986.

The product of its digits is 1728, while the sum is 26.

The square root of 261449 is about 511.3208386131. The cubic root of 261449 is about 63.9433906979.

The spelling of 261449 in words is "two hundred sixty-one thousand, four hundred forty-nine".