705431321 has 8 divisors (see below), whose sum is σ = 841259904. Its totient is φ = 578365920.

The previous prime is 705431263. The next prime is 705431327. The reversal of 705431321 is 123134507.

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-705431321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (705431327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2190620 + ... + 2190941.

It is an arithmetic number, because the mean of its divisors is an integer number (105157488).

Almost surely, 2^705431321 is an apocalyptic number.

It is an amenable number.

705431321 is a deficient number, since it is larger than the sum of its proper divisors (135828583).

705431321 is a wasteful number, since it uses less digits than its factorization.

705431321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4381591.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 705431321 is about 26559.9570971039. The cubic root of 705431321 is about 890.1945124660.

Adding to 705431321 its reverse (123134507), we get a palindrome (828565828).

The spelling of 705431321 in words is "seven hundred five million, four hundred thirty-one thousand, three hundred twenty-one".