259209581 has 4 divisors (see below), whose sum is σ = 262332672. Its totient is φ = 256086492.

The previous prime is 259209553. The next prime is 259209583. The reversal of 259209581 is 185902952.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 259209581 - 2¹⁰ = 259208557 is a prime.

It is a super-2 number, since 2×259209581² = 134379213764391122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259209583) 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, 1561421 + ... + 1561586.

It is an arithmetic number, because the mean of its divisors is an integer number (65583168).

Almost surely, 2^259209581 is an apocalyptic number.

It is an amenable number.

259209581 is a deficient number, since it is larger than the sum of its proper divisors (3123091).

259209581 is an equidigital number, since it uses as much as digits as its factorization.

259209581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123090.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 259209581 is about 16099.9869875724. The cubic root of 259209581 is about 637.6029973786.

The spelling of 259209581 in words is "two hundred fifty-nine million, two hundred nine thousand, five hundred eighty-one".