261745461 has 6 divisors (see below), whose sum is σ = 378076790. Its totient is φ = 174496968.

The previous prime is 261745453. The next prime is 261745499. The reversal of 261745461 is 164547162.

261745461 is a `hidden beast` number, since 26 + 174 + 5 + 461 = 666.

It can be written as a sum of positive squares in only one way, i.e., 149597361 + 112148100 = 12231^2 + 10590^2 .

It is not a de Polignac number, because 261745461 - 2³ = 261745453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261745261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14541406 + ... + 14541423.

Almost surely, 2^261745461 is an apocalyptic number.

It is an amenable number.

261745461 is a deficient number, since it is larger than the sum of its proper divisors (116331329).

261745461 is a wasteful number, since it uses less digits than its factorization.

261745461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29082835 (or 29082832 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 261745461 is about 16178.5494096350. The cubic root of 261745461 is about 639.6755036314.

The spelling of 261745461 in words is "two hundred sixty-one million, seven hundred forty-five thousand, four hundred sixty-one".