647331 has 8 divisors (see below), whose sum is σ = 881664. Its totient is φ = 422280.

The previous prime is 647327. The next prime is 647333. The reversal of 647331 is 133746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 647331 - 2² = 647327 is a prime.

It is a super-2 number, since 2×647331² = 838074847122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (647333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2155 + ... + 2436.

It is an arithmetic number, because the mean of its divisors is an integer number (110208).

2⁶⁴⁷³³¹ is an apocalyptic number.

647331 is a deficient number, since it is larger than the sum of its proper divisors (234333).

647331 is a wasteful number, since it uses less digits than its factorization.

647331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4641.

The product of its digits is 1512, while the sum is 24.

The square root of 647331 is about 804.5688286281. The cubic root of 647331 is about 86.5051841815.

The spelling of 647331 in words is "six hundred forty-seven thousand, three hundred thirty-one".