647901 has 12 divisors (see below), whose sum is σ = 943228. Its totient is φ = 428544.

The previous prime is 647893. The next prime is 647909. The reversal of 647901 is 109746.

It is an interprime number because it is at equal distance from previous prime (647893) and next prime (647909).

It can be written as a sum of positive squares in 2 ways, for example, as 251001 + 396900 = 501^2 + 630^2 .

It is not a de Polignac number, because 647901 - 2³ = 647893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647901.

It is not an unprimeable number, because it can be changed into a prime (647909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1551 + ... + 1923.

2⁶⁴⁷⁹⁰¹ is an apocalyptic number.

It is an amenable number.

647901 is a deficient number, since it is larger than the sum of its proper divisors (295327).

647901 is a wasteful number, since it uses less digits than its factorization.

647901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 569 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 647901 is about 804.9229776817. The cubic root of 647901 is about 86.5305671203.

The spelling of 647901 in words is "six hundred forty-seven thousand, nine hundred one".