259953985 has 4 divisors (see below), whose sum is σ = 311944788. Its totient is φ = 207963184.

The previous prime is 259953979. The next prime is 259953989. The reversal of 259953985 is 589359952.

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

It can be written as a sum of positive squares in 2 ways, for example, as 126135361 + 133818624 = 11231^2 + 11568^2 .

It is a cyclic number.

It is not a de Polignac number, because 259953985 - 2⁷ = 259953857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (259953989) 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, 25995394 + ... + 25995403.

It is an arithmetic number, because the mean of its divisors is an integer number (77986197).

Almost surely, 2^259953985 is an apocalyptic number.

It is an amenable number.

259953985 is a deficient number, since it is larger than the sum of its proper divisors (51990803).

259953985 is an equidigital number, since it uses as much as digits as its factorization.

259953985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51990802.

The product of its digits is 4374000, while the sum is 55.

The square root of 259953985 is about 16123.0885688816. The cubic root of 259953985 is about 638.2127749805.

The spelling of 259953985 in words is "two hundred fifty-nine million, nine hundred fifty-three thousand, nine hundred eighty-five".