647451361 has 4 divisors (see below), whose sum is σ = 669777300. Its totient is φ = 625125424.

The previous prime is 647451359. The next prime is 647451379. The reversal of 647451361 is 163154746.

647451361 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.

It can be written as a sum of positive squares in 2 ways, for example, as 486643600 + 160807761 = 22060^2 + 12681^2 .

It is a cyclic number.

It is not a de Polignac number, because 647451361 - 2¹ = 647451359 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 647451361.

It is not an unprimeable number, because it can be changed into a prime (647451331) 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, 11162926 + ... + 11162983.

It is an arithmetic number, because the mean of its divisors is an integer number (167444325).

Almost surely, 2^647451361 is an apocalyptic number.

It is an amenable number.

647451361 is a deficient number, since it is larger than the sum of its proper divisors (22325939).

647451361 is a wasteful number, since it uses less digits than its factorization.

647451361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22325938.

The product of its digits is 60480, while the sum is 37.

The square root of 647451361 is about 25445.0655530694. The cubic root of 647451361 is about 865.1054527456.

The spelling of 647451361 in words is "six hundred forty-seven million, four hundred fifty-one thousand, three hundred sixty-one".