647307231 has 16 divisors (see below), whose sum is σ = 907977600. Its totient is φ = 409592288.

The previous prime is 647307217. The next prime is 647307233. The reversal of 647307231 is 132703746.

It is not a de Polignac number, because 647307231 - 2¹⁰ = 647306207 is a prime.

It is a super-2 number, since 2×647307231² = 838013302609774722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 647307192 and 647307201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647307233) 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 15 ways as a sum of consecutive naturals, for example, 57921 + ... + 68186.

It is an arithmetic number, because the mean of its divisors is an integer number (56748600).

Almost surely, 2^647307231 is an apocalyptic number.

647307231 is a deficient number, since it is larger than the sum of its proper divisors (260670369).

647307231 is a wasteful number, since it uses less digits than its factorization.

647307231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126198.

The product of its (nonzero) digits is 21168, while the sum is 33.

The square root of 647307231 is about 25442.2332156594. The cubic root of 647307231 is about 865.0412538936.

The spelling of 647307231 in words is "six hundred forty-seven million, three hundred seven thousand, two hundred thirty-one".