261471 has 8 divisors (see below), whose sum is σ = 398464. Its totient is φ = 149400.

The previous prime is 261467. The next prime is 261509. The reversal of 261471 is 174162.

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

It is not a de Polignac number, because 261471 - 2² = 261467 is a prime.

It is a super-3 number, since 3×261471³ = 53628029336970333, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 12451 = 261471 / (2 + 6 + 1 + 4 + 7 + 1).

It is a Duffinian number.

261471 is a lucky number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261431) 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, 6205 + ... + 6246.

It is an arithmetic number, because the mean of its divisors is an integer number (49808).

2²⁶¹⁴⁷¹ is an apocalyptic number.

261471 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

261471 is a deficient number, since it is larger than the sum of its proper divisors (136993).

261471 is a wasteful number, since it uses less digits than its factorization.

261471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12461.

The product of its digits is 336, while the sum is 21.

The square root of 261471 is about 511.3423510722. The cubic root of 261471 is about 63.9451841836.

The spelling of 261471 in words is "two hundred sixty-one thousand, four hundred seventy-one".