647662231 has 4 divisors (see below), whose sum is σ = 647713264. Its totient is φ = 647611200.

The previous prime is 647662217. The next prime is 647662237. The reversal of 647662231 is 132266746.

647662231 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 brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 647662231 - 2⁹ = 647661719 is a prime.

It is a super-2 number, since 2×647662231² = 838932730927794722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647662237) 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, 9991 + ... + 37351.

It is an arithmetic number, because the mean of its divisors is an integer number (161928316).

Almost surely, 2^647662231 is an apocalyptic number.

647662231 is a deficient number, since it is larger than the sum of its proper divisors (51033).

647662231 is a wasteful number, since it uses less digits than its factorization.

647662231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51032.

The product of its digits is 72576, while the sum is 37.

The square root of 647662231 is about 25449.2088482137. The cubic root of 647662231 is about 865.1993619804.

The spelling of 647662231 in words is "six hundred forty-seven million, six hundred sixty-two thousand, two hundred thirty-one".