261943271 has 4 divisors (see below), whose sum is σ = 261979200. Its totient is φ = 261907344.

The previous prime is 261943247. The next prime is 261943289. The reversal of 261943271 is 172349162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 261943271 - 2¹⁴ = 261926887 is a prime.

It is a super-2 number, since 2×261943271² = 137228554444358882, 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 (261943471) 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, 2711 + ... + 23048.

It is an arithmetic number, because the mean of its divisors is an integer number (65494800).

Almost surely, 2^261943271 is an apocalyptic number.

261943271 is a deficient number, since it is larger than the sum of its proper divisors (35929).

261943271 is a wasteful number, since it uses less digits than its factorization.

261943271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35928.

The product of its digits is 18144, while the sum is 35.

The square root of 261943271 is about 16184.6615967094. The cubic root of 261943271 is about 639.8366046095.

The spelling of 261943271 in words is "two hundred sixty-one million, nine hundred forty-three thousand, two hundred seventy-one".