261652171 has 4 divisors (see below), whose sum is σ = 285438744. Its totient is φ = 237865600.

The previous prime is 261652169. The next prime is 261652213. The reversal of 261652171 is 171256162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261652171 - 2¹ = 261652169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261682171) 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, 11893270 + ... + 11893291.

It is an arithmetic number, because the mean of its divisors is an integer number (71359686).

Almost surely, 2^261652171 is an apocalyptic number.

261652171 is a deficient number, since it is larger than the sum of its proper divisors (23786573).

261652171 is a wasteful number, since it uses less digits than its factorization.

261652171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23786572.

The product of its digits is 5040, while the sum is 31.

The square root of 261652171 is about 16175.6660141090. Note that the first 3 decimals coincide. The cubic root of 261652171 is about 639.5994979595.

The spelling of 261652171 in words is "two hundred sixty-one million, six hundred fifty-two thousand, one hundred seventy-one".