261467591 has 16 divisors (see below), whose sum is σ = 326554368. Its totient is φ = 203385600.

The previous prime is 261467587. The next prime is 261467593. The reversal of 261467591 is 195764162.

It is not a de Polignac number, because 261467591 - 2² = 261467587 is a prime.

It is a super-2 number, since 2×261467591² = 136730602286686562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261467593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46871 + ... + 52151.

It is an arithmetic number, because the mean of its divisors is an integer number (20409648).

Almost surely, 2^261467591 is an apocalyptic number.

261467591 is a deficient number, since it is larger than the sum of its proper divisors (65086777).

261467591 is a wasteful number, since it uses less digits than its factorization.

261467591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5942.

The product of its digits is 90720, while the sum is 41.

The square root of 261467591 is about 16169.9595237589. The cubic root of 261467591 is about 639.4490628143.

The spelling of 261467591 in words is "two hundred sixty-one million, four hundred sixty-seven thousand, five hundred ninety-one".