259649881 has 4 divisors (see below), whose sum is σ = 262032100. Its totient is φ = 257267664.

The previous prime is 259649879. The next prime is 259649939. The reversal of 259649881 is 188946952.

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 215825481 + 43824400 = 14691^2 + 6620^2 .

It is a cyclic number.

It is not a de Polignac number, because 259649881 - 2¹ = 259649879 is a prime.

It is a super-2 number, since 2×259649881² = 134836121406628322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (259649821) 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, 1190946 + ... + 1191163.

It is an arithmetic number, because the mean of its divisors is an integer number (65508025).

Almost surely, 2^259649881 is an apocalyptic number.

It is an amenable number.

259649881 is a deficient number, since it is larger than the sum of its proper divisors (2382219).

259649881 is a wasteful number, since it uses less digits than its factorization.

259649881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382218.

The product of its digits is 1244160, while the sum is 52.

The square root of 259649881 is about 16113.6551098750. The cubic root of 259649881 is about 637.9638093942.

The spelling of 259649881 in words is "two hundred fifty-nine million, six hundred forty-nine thousand, eight hundred eighty-one".