259011981 has 6 divisors (see below), whose sum is σ = 374128430. Its totient is φ = 172674648.

The previous prime is 259011941. The next prime is 259011997. The reversal of 259011981 is 189110952.

It can be written as a sum of positive squares in only one way, i.e., 248062500 + 10949481 = 15750^2 + 3309^2 .

It is not a de Polignac number, because 259011981 - 2¹⁰ = 259010957 is a prime.

It is a super-2 number, since 2×259011981² = 134174412603088722, 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 (259011941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14389546 + ... + 14389563.

Almost surely, 2^259011981 is an apocalyptic number.

It is an amenable number.

259011981 is a deficient number, since it is larger than the sum of its proper divisors (115116449).

259011981 is a wasteful number, since it uses less digits than its factorization.

259011981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28779115 (or 28779112 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 259011981 is about 16093.8491666848. The cubic root of 259011981 is about 637.4409375501.

The spelling of 259011981 in words is "two hundred fifty-nine million, eleven thousand, nine hundred eighty-one".