260644261 has 4 divisors (see below), whose sum is σ = 274362400. Its totient is φ = 246926124.

The previous prime is 260644253. The next prime is 260644273. The reversal of 260644261 is 162446062.

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, and also an emirpimes, since its reverse is a distinct semiprime: 162446062 = 2 ⋅81223031.

It is a cyclic number.

It is not a de Polignac number, because 260644261 - 2³ = 260644253 is a prime.

It is a super-2 number, since 2×260644261² = 135870861584472242, 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 (260644231) 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, 6859041 + ... + 6859078.

It is an arithmetic number, because the mean of its divisors is an integer number (68590600).

Almost surely, 2^260644261 is an apocalyptic number.

It is an amenable number.

260644261 is a deficient number, since it is larger than the sum of its proper divisors (13718139).

260644261 is a wasteful number, since it uses less digits than its factorization.

260644261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13718138.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 260644261 is about 16144.4808216307. The cubic root of 260644261 is about 638.7771743551. Note that the first 3 decimals are identical.

The spelling of 260644261 in words is "two hundred sixty million, six hundred forty-four thousand, two hundred sixty-one".