261403903 has 8 divisors (see below), whose sum is σ = 263850480. Its totient is φ = 258968640.

The previous prime is 261403871. The next prime is 261403939. The reversal of 261403903 is 309304162.

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

It is a cyclic number.

It is not a de Polignac number, because 261403903 - 2⁵ = 261403871 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 (261403963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47701 + ... + 52897.

It is an arithmetic number, because the mean of its divisors is an integer number (32981310).

Almost surely, 2^261403903 is an apocalyptic number.

261403903 is a deficient number, since it is larger than the sum of its proper divisors (2446577).

261403903 is a wasteful number, since it uses less digits than its factorization.

261403903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5657.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 261403903 is about 16167.9900729806. The cubic root of 261403903 is about 639.3971398222.

The spelling of 261403903 in words is "two hundred sixty-one million, four hundred three thousand, nine hundred three".