261271641 has 8 divisors (see below), whose sum is σ = 366697120. Its totient is φ = 165013632.

The previous prime is 261271613. The next prime is 261271687. The reversal of 261271641 is 146172162.

261271641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261271641 - 2¹³ = 261263449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261271599 and 261271608.

It is not an unprimeable number, because it can be changed into a prime (261271141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2291800 + ... + 2291913.

It is an arithmetic number, because the mean of its divisors is an integer number (45837140).

Almost surely, 2^261271641 is an apocalyptic number.

It is an amenable number.

261271641 is a deficient number, since it is larger than the sum of its proper divisors (105425479).

261271641 is a wasteful number, since it uses less digits than its factorization.

261271641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4583735.

The product of its digits is 4032, while the sum is 30.

The square root of 261271641 is about 16163.8993129752. The cubic root of 261271641 is about 639.2892834737.

The spelling of 261271641 in words is "two hundred sixty-one million, two hundred seventy-one thousand, six hundred forty-one".