261596903 has 2 divisors, whose sum is σ = 261596904. Its totient is φ = 261596902.

The previous prime is 261596897. The next prime is 261596911. The reversal of 261596903 is 309695162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261596903 - 2¹⁴ = 261580519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261595903) 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 as a sum of consecutive naturals, namely, 130798451 + 130798452.

It is an arithmetic number, because the mean of its divisors is an integer number (130798452).

Almost surely, 2^261596903 is an apocalyptic number.

261596903 is a deficient number, since it is larger than the sum of its proper divisors (1).

261596903 is an equidigital number, since it uses as much as digits as its factorization.

261596903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 261596903 is about 16173.9575552800. The cubic root of 261596903 is about 639.5544612298.

The spelling of 261596903 in words is "two hundred sixty-one million, five hundred ninety-six thousand, nine hundred three".