261947383 has 8 divisors (see below), whose sum is σ = 271499360. Its totient is φ = 252525600.

The previous prime is 261947369. The next prime is 261947393. The reversal of 261947383 is 383749162.

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

It is a cyclic number.

It is not a de Polignac number, because 261947383 - 2²¹ = 259850231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261947333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28443 + ... + 36508.

It is an arithmetic number, because the mean of its divisors is an integer number (33937420).

Almost surely, 2^261947383 is an apocalyptic number.

261947383 is a deficient number, since it is larger than the sum of its proper divisors (9551977).

261947383 is a wasteful number, since it uses less digits than its factorization.

261947383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65097.

The product of its digits is 217728, while the sum is 43.

The square root of 261947383 is about 16184.7886300687. The cubic root of 261947383 is about 639.8399526554.

The spelling of 261947383 in words is "two hundred sixty-one million, nine hundred forty-seven thousand, three hundred eighty-three".