261384323 has 4 divisors (see below), whose sum is σ = 261493080. Its totient is φ = 261275568.

The previous prime is 261384283. The next prime is 261384379. The reversal of 261384323 is 323483162.

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 261384323 - 2¹⁶ = 261318787 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 261384323.

It is not an unprimeable number, because it can be changed into a prime (261344323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50690 + ... + 55607.

It is an arithmetic number, because the mean of its divisors is an integer number (65373270).

Almost surely, 2^261384323 is an apocalyptic number.

261384323 is a deficient number, since it is larger than the sum of its proper divisors (108757).

261384323 is a wasteful number, since it uses less digits than its factorization.

261384323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108756.

The product of its digits is 20736, while the sum is 32.

The square root of 261384323 is about 16167.3845441989. The cubic root of 261384323 is about 639.3811751172.

The spelling of 261384323 in words is "two hundred sixty-one million, three hundred eighty-four thousand, three hundred twenty-three".