261698 has 16 divisors (see below), whose sum is σ = 427680. Its totient is φ = 119616.

The previous prime is 261697. The next prime is 261707. The reversal of 261698 is 896162.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261698.

It is not an unprimeable number, because it can be changed into a prime (261697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1373 + ... + 1551.

It is an arithmetic number, because the mean of its divisors is an integer number (26730).

2²⁶¹⁶⁹⁸ is an apocalyptic number.

261698 is a deficient number, since it is larger than the sum of its proper divisors (165982).

261698 is a wasteful number, since it uses less digits than its factorization.

261698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

The product of its digits is 5184, while the sum is 32.

The square root of 261698 is about 511.5642677123. The cubic root of 261698 is about 63.9636838237.

It can be divided in two parts, 261 and 698, that added together give a palindrome (959).

The spelling of 261698 in words is "two hundred sixty-one thousand, six hundred ninety-eight".