261903 has 8 divisors (see below), whose sum is σ = 354688. Its totient is φ = 171864.

The previous prime is 261887. The next prime is 261917. The reversal of 261903 is 309162.

261903 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261903 - 2⁴ = 261887 is a prime.

It is a Duffinian number.

261903 is strictly pandigital in base 7.

It is a zygodrome in base 2 and base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 261903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451 + ... + 852.

It is an arithmetic number, because the mean of its divisors is an integer number (44336).

2²⁶¹⁹⁰³ is an apocalyptic number.

261903 is a deficient number, since it is larger than the sum of its proper divisors (92785).

261903 is a wasteful number, since it uses less digits than its factorization.

261903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 261903 is about 511.7645943205. The cubic root of 261903 is about 63.9803813565.

The spelling of 261903 in words is "two hundred sixty-one thousand, nine hundred three".