647412321 has 4 divisors (see below), whose sum is σ = 863216432. Its totient is φ = 431608212.

The previous prime is 647412319. The next prime is 647412341. The reversal of 647412321 is 123214746.

647412321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 647412321 - 2¹ = 647412319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647412341) 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, 107902051 + ... + 107902056.

It is an arithmetic number, because the mean of its divisors is an integer number (215804108).

Almost surely, 2^647412321 is an apocalyptic number.

It is an amenable number.

647412321 is a deficient number, since it is larger than the sum of its proper divisors (215804111).

647412321 is a wasteful number, since it uses less digits than its factorization.

647412321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215804110.

The product of its digits is 8064, while the sum is 30.

The square root of 647412321 is about 25444.2983986590. The cubic root of 647412321 is about 865.0880643631.

The spelling of 647412321 in words is "six hundred forty-seven million, four hundred twelve thousand, three hundred twenty-one".