261424785 has 16 divisors (see below), whose sum is σ = 436466304. Its totient is φ = 133364352.

The previous prime is 261424747. The next prime is 261424789. The reversal of 261424785 is 587424162.

It is not a de Polignac number, because 261424785 - 2¹⁰ = 261423761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261424789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378532 + ... + 379221.

It is an arithmetic number, because the mean of its divisors is an integer number (27279144).

Almost surely, 2^261424785 is an apocalyptic number.

It is an amenable number.

261424785 is a deficient number, since it is larger than the sum of its proper divisors (175041519).

261424785 is a wasteful number, since it uses less digits than its factorization.

261424785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757784.

The product of its digits is 107520, while the sum is 39.

The square root of 261424785 is about 16168.6358422719. The cubic root of 261424785 is about 639.4141652446.

The spelling of 261424785 in words is "two hundred sixty-one million, four hundred twenty-four thousand, seven hundred eighty-five".