647137 has 4 divisors (see below), whose sum is σ = 650416. Its totient is φ = 643860.

The previous prime is 647131. The next prime is 647147. The reversal of 647137 is 731746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647137 - 2¹⁹ = 122849 is a prime.

It is a Duffinian number.

647137 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (647131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1323 + ... + 1744.

It is an arithmetic number, because the mean of its divisors is an integer number (162604).

2⁶⁴⁷¹³⁷ is an apocalyptic number.

It is an amenable number.

647137 is a deficient number, since it is larger than the sum of its proper divisors (3279).

647137 is a wasteful number, since it uses less digits than its factorization.

647137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278.

The product of its digits is 3528, while the sum is 28.

The square root of 647137 is about 804.4482581248. The cubic root of 647137 is about 86.4965416774.

It can be divided in two parts, 647 and 137, that added together give a square (784 = 28²).

The spelling of 647137 in words is "six hundred forty-seven thousand, one hundred thirty-seven".