320642351 has 4 divisors (see below), whose sum is σ = 321834600. Its totient is φ = 319450104.

The previous prime is 320642341. The next prime is 320642383. The reversal of 320642351 is 153246023.

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 320642351 - 2²⁶ = 253533487 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 320642351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320642341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 595721 + ... + 596258.

It is an arithmetic number, because the mean of its divisors is an integer number (80458650).

Almost surely, 2^320642351 is an apocalyptic number.

320642351 is a deficient number, since it is larger than the sum of its proper divisors (1192249).

320642351 is a wasteful number, since it uses less digits than its factorization.

320642351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192248.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 320642351 is about 17906.4890751928. The cubic root of 320642351 is about 684.4477414282.

Adding to 320642351 its reverse (153246023), we get a palindrome (473888374).

The spelling of 320642351 in words is "three hundred twenty million, six hundred forty-two thousand, three hundred fifty-one".