261383 has 4 divisors (see below), whose sum is σ = 275160. Its totient is φ = 247608.

The previous prime is 261379. The next prime is 261389. The reversal of 261383 is 383162.

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

It is not a de Polignac number, because 261383 - 2² = 261379 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261389) 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, 6860 + ... + 6897.

It is an arithmetic number, because the mean of its divisors is an integer number (68790).

2²⁶¹³⁸³ is an apocalyptic number.

261383 is a deficient number, since it is larger than the sum of its proper divisors (13777).

261383 is a wasteful number, since it uses less digits than its factorization.

261383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13776.

The product of its digits is 864, while the sum is 23.

The square root of 261383 is about 511.2562958048. The cubic root of 261383 is about 63.9380096370.

The spelling of 261383 in words is "two hundred sixty-one thousand, three hundred eighty-three".