261316443 has 8 divisors (see below), whose sum is σ = 366760000. Its totient is φ = 165041928.

The previous prime is 261316441. The next prime is 261316463. The reversal of 261316443 is 344613162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261316443 - 2¹ = 261316441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261316443.

It is not an unprimeable number, because it can be changed into a prime (261316441) 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 7 ways as a sum of consecutive naturals, for example, 2292193 + ... + 2292306.

It is an arithmetic number, because the mean of its divisors is an integer number (45845000).

Almost surely, 2^261316443 is an apocalyptic number.

261316443 is a deficient number, since it is larger than the sum of its proper divisors (105443557).

261316443 is a wasteful number, since it uses less digits than its factorization.

261316443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4584521.

The product of its digits is 10368, while the sum is 30.

The square root of 261316443 is about 16165.2851196631. The cubic root of 261316443 is about 639.3258224584.

The spelling of 261316443 in words is "two hundred sixty-one million, three hundred sixteen thousand, four hundred forty-three".