261323393 has 8 divisors (see below), whose sum is σ = 263566368. Its totient is φ = 259088544.

The previous prime is 261323369. The next prime is 261323399. The reversal of 261323393 is 393323162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261323393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261323399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74405 + ... + 77837.

It is an arithmetic number, because the mean of its divisors is an integer number (32945796).

Almost surely, 2^261323393 is an apocalyptic number.

It is an amenable number.

261323393 is a deficient number, since it is larger than the sum of its proper divisors (2242975).

261323393 is a wasteful number, since it uses less digits than its factorization.

261323393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4063.

The product of its digits is 17496, while the sum is 32.

The square root of 261323393 is about 16165.5000850577. The cubic root of 261323393 is about 639.3314902675.

The spelling of 261323393 in words is "two hundred sixty-one million, three hundred twenty-three thousand, three hundred ninety-three".