261847873 has 24 divisors (see below), whose sum is σ = 326381120. Its totient is φ = 205208640.

The previous prime is 261847871. The next prime is 261847877. The reversal of 261847873 is 378748162.

It is not a de Polignac number, because 261847873 - 2¹ = 261847871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261847871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110683 + ... + 113023.

Almost surely, 2^261847873 is an apocalyptic number.

It is an amenable number.

261847873 is a deficient number, since it is larger than the sum of its proper divisors (64533247).

261847873 is a wasteful number, since it uses less digits than its factorization.

261847873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425 (or 2396 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The square root of 261847873 is about 16181.7141551815. The cubic root of 261847873 is about 639.7589204304.

The spelling of 261847873 in words is "two hundred sixty-one million, eight hundred forty-seven thousand, eight hundred seventy-three".