260001281 has 4 divisors (see below), whose sum is σ = 275295492. Its totient is φ = 244707072.

The previous prime is 260001277. The next prime is 260001283. The reversal of 260001281 is 182100062.

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 232867600 + 27133681 = 15260^2 + 5209^2 .

It is a cyclic number.

It is not a de Polignac number, because 260001281 - 2² = 260001277 is a prime.

It is a super-2 number, since 2×260001281² = 135201332243281922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (260001283) 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, 7647080 + ... + 7647113.

It is an arithmetic number, because the mean of its divisors is an integer number (68823873).

Almost surely, 2^260001281 is an apocalyptic number.

It is an amenable number.

260001281 is a deficient number, since it is larger than the sum of its proper divisors (15294211).

260001281 is a wasteful number, since it uses less digits than its factorization.

260001281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15294210.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 260001281 is about 16124.5552186719. Note that the first 3 decimals coincide. The cubic root of 260001281 is about 638.2514780879.

The spelling of 260001281 in words is "two hundred sixty million, one thousand, two hundred eighty-one".