261484791 has 4 divisors (see below), whose sum is σ = 348646392. Its totient is φ = 174323192.

The previous prime is 261484771. The next prime is 261484801. The reversal of 261484791 is 197484162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261484791 - 2¹⁰ = 261483767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261484771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43580796 + ... + 43580801.

It is an arithmetic number, because the mean of its divisors is an integer number (87161598).

Almost surely, 2^261484791 is an apocalyptic number.

261484791 is a deficient number, since it is larger than the sum of its proper divisors (87161601).

261484791 is an equidigital number, since it uses as much as digits as its factorization.

261484791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87161600.

The product of its digits is 96768, while the sum is 42.

The square root of 261484791 is about 16170.4913654471. The cubic root of 261484791 is about 639.4630840329.

The spelling of 261484791 in words is "two hundred sixty-one million, four hundred eighty-four thousand, seven hundred ninety-one".