259491961 has 4 divisors (see below), whose sum is σ = 274756212. Its totient is φ = 244227712.

The previous prime is 259491959. The next prime is 259492033. The reversal of 259491961 is 169194952.

It is a happy number.

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 194769936 + 64722025 = 13956^2 + 8045^2 .

It is not a de Polignac number, because 259491961 - 2¹ = 259491959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (259491941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7632100 + ... + 7632133.

It is an arithmetic number, because the mean of its divisors is an integer number (68689053).

Almost surely, 2^259491961 is an apocalyptic number.

It is an amenable number.

259491961 is a deficient number, since it is larger than the sum of its proper divisors (15264251).

259491961 is a wasteful number, since it uses less digits than its factorization.

259491961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15264250.

The product of its digits is 174960, while the sum is 46.

The square root of 259491961 is about 16108.7541728093. The cubic root of 259491961 is about 637.8344458628.

The spelling of 259491961 in words is "two hundred fifty-nine million, four hundred ninety-one thousand, nine hundred sixty-one".