647353491 has 4 divisors (see below), whose sum is σ = 863137992. Its totient is φ = 431568992.

The previous prime is 647353481. The next prime is 647353537. The reversal of 647353491 is 194353746.

647353491 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 is a cyclic number.

It is not a de Polignac number, because 647353491 - 2¹³ = 647345299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647353481) 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, 107892246 + ... + 107892251.

It is an arithmetic number, because the mean of its divisors is an integer number (215784498).

Almost surely, 2^647353491 is an apocalyptic number.

647353491 is a deficient number, since it is larger than the sum of its proper divisors (215784501).

647353491 is a wasteful number, since it uses less digits than its factorization.

647353491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215784500.

The product of its digits is 272160, while the sum is 42.

The square root of 647353491 is about 25443.1423177248. The cubic root of 647353491 is about 865.0618602112.

The spelling of 647353491 in words is "six hundred forty-seven million, three hundred fifty-three thousand, four hundred ninety-one".