261047745 has 192 divisors, whose sum is σ = 595353600. Its totient is φ = 107775360.

The previous prime is 261047713. The next prime is 261047771. The reversal of 261047745 is 547740162.

It is not a de Polignac number, because 261047745 - 2⁵ = 261047713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3896202 + ... + 3896268.

It is an arithmetic number, because the mean of its divisors is an integer number (3100800).

Almost surely, 2^261047745 is an apocalyptic number.

It is an amenable number.

261047745 is an abundant number, since it is smaller than the sum of its proper divisors (334305855).

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

261047745 is a wasteful number, since it uses less digits than its factorization.

261047745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 261047745 is about 16156.9720244853. The cubic root of 261047745 is about 639.1066188996.

The spelling of 261047745 in words is "two hundred sixty-one million, forty-seven thousand, seven hundred forty-five".