261167071 has 4 divisors (see below), whose sum is σ = 284909544. Its totient is φ = 237424600.

The previous prime is 261167059. The next prime is 261167131. The reversal of 261167071 is 170761162.

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 261167071 - 2²⁷ = 126949343 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261167371) 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, 11871220 + ... + 11871241.

It is an arithmetic number, because the mean of its divisors is an integer number (71227386).

Almost surely, 2^261167071 is an apocalyptic number.

261167071 is a deficient number, since it is larger than the sum of its proper divisors (23742473).

261167071 is a wasteful number, since it uses less digits than its factorization.

261167071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23742472.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 261167071 is about 16160.6643118406. The cubic root of 261167071 is about 639.2039834889.

The spelling of 261167071 in words is "two hundred sixty-one million, one hundred sixty-seven thousand, seventy-one".