261693 has 6 divisors (see below), whose sum is σ = 378014. Its totient is φ = 174456.

The previous prime is 261673. The next prime is 261697. The reversal of 261693 is 396162.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 248004 + 13689 = 498^2 + 117^2 .

It is not a de Polignac number, because 261693 - 2¹³ = 253501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14530 + ... + 14547.

2²⁶¹⁶⁹³ is an apocalyptic number.

It is an amenable number.

261693 is a deficient number, since it is larger than the sum of its proper divisors (116321).

261693 is a wasteful number, since it uses less digits than its factorization.

261693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29083 (or 29080 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 261693 is about 511.5593807174. The cubic root of 261693 is about 63.9632764579.

The spelling of 261693 in words is "two hundred sixty-one thousand, six hundred ninety-three".