391424158321 has 27 divisors (see below), whose sum is σ = 459343840761. Its totient is φ = 332574677064.

The previous prime is 391424158289. The next prime is 391424158361. The reversal of 391424158321 is 123851424193.

The square root of 391424158321 is 625639.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 391424158321 - 2⁵ = 391424158289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391424158361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 608746426 + ... + 608747068.

It is an arithmetic number, because the mean of its divisors is an integer number (17012734843).

Almost surely, 2^391424158321 is an apocalyptic number.

391424158321 is the 625639-th square number.

391424158321 is the 312820-th centered octagonal number.

It is an amenable number.

391424158321 is a deficient number, since it is larger than the sum of its proper divisors (67919682440).

391424158321 is an frugal number, since it uses more digits than its factorization.

391424158321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578 (or 789 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The spelling of 391424158321 in words is "three hundred ninety-one billion, four hundred twenty-four million, one hundred fifty-eight thousand, three hundred twenty-one".