261499 has 4 divisors (see below), whose sum is σ = 298864. Its totient is φ = 224136.

The previous prime is 261467. The next prime is 261509. The reversal of 261499 is 994162.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 261499 - 2⁵ = 261467 is a prime.

It is a Duffinian number.

261499 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 261499.

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, 18672 + ... + 18685.

It is an arithmetic number, because the mean of its divisors is an integer number (74716).

2²⁶¹⁴⁹⁹ is an apocalyptic number.

261499 is a deficient number, since it is larger than the sum of its proper divisors (37365).

261499 is an equidigital number, since it uses as much as digits as its factorization.

261499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37364.

The product of its digits is 3888, while the sum is 31.

The square root of 261499 is about 511.3697292566. The cubic root of 261499 is about 63.9474666563.

The spelling of 261499 in words is "two hundred sixty-one thousand, four hundred ninety-nine".