261165436 has 12 divisors (see below), whose sum is σ = 522330928. Its totient is φ = 111928032.

The previous prime is 261165433. The next prime is 261165439. The reversal of 261165436 is 634561162.

261165436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261165433) and next prime (261165439).

261165436 is an admirable number.

It is a super-4 number, since 4×261165436⁴ (a number of 35 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261165433) 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, 4663641 + ... + 4663696.

Almost surely, 2^261165436 is an apocalyptic number.

It is an amenable number.

261165436 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261165436 is a wasteful number, since it uses less digits than its factorization.

261165436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9327348 (or 9327346 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 261165436 is about 16160.6137259697. The cubic root of 261165436 is about 639.2026496037.

The spelling of 261165436 in words is "two hundred sixty-one million, one hundred sixty-five thousand, four hundred thirty-six".