261502271 has 8 divisors (see below), whose sum is σ = 266133504. Its totient is φ = 256911480.

The previous prime is 261502261. The next prime is 261502321. The reversal of 261502271 is 172205162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261502271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261502271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261502201) 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, 3086 + ... + 23076.

It is an arithmetic number, because the mean of its divisors is an integer number (33266688).

Almost surely, 2^261502271 is an apocalyptic number.

261502271 is a deficient number, since it is larger than the sum of its proper divisors (4631233).

261502271 is a wasteful number, since it uses less digits than its factorization.

261502271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20221.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 261502271 is about 16171.0318471024. The cubic root of 261502271 is about 639.4773328739.

The spelling of 261502271 in words is "two hundred sixty-one million, five hundred two thousand, two hundred seventy-one".