261065172 has 24 divisors (see below), whose sum is σ = 609821856. Its totient is φ = 86926048.

The previous prime is 261065153. The next prime is 261065173. The reversal of 261065172 is 271560162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261065173) 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, 123 + ... + 22850.

It is an arithmetic number, because the mean of its divisors is an integer number (25409244).

Almost surely, 2^261065172 is an apocalyptic number.

It is an amenable number.

261065172 is an abundant number, since it is smaller than the sum of its proper divisors (348756684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261065172 is a wasteful number, since it uses less digits than its factorization.

261065172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23927 (or 23925 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 261065172 is about 16157.5113182693. The cubic root of 261065172 is about 639.1208403890.

The spelling of 261065172 in words is "two hundred sixty-one million, sixty-five thousand, one hundred seventy-two".