647254253 has 4 divisors (see below), whose sum is σ = 648246108. Its totient is φ = 646262400.

The previous prime is 647254229. The next prime is 647254259. The reversal of 647254253 is 352452746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142038724 + 505215529 = 11918^2 + 22477^2 .

It is a cyclic number.

It is not a de Polignac number, because 647254253 - 2¹² = 647250157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647254259) 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, 494948 + ... + 496253.

It is an arithmetic number, because the mean of its divisors is an integer number (162061527).

Almost surely, 2^647254253 is an apocalyptic number.

It is an amenable number.

647254253 is a deficient number, since it is larger than the sum of its proper divisors (991855).

647254253 is an equidigital number, since it uses as much as digits as its factorization.

647254253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991854.

The product of its digits is 201600, while the sum is 38.

The square root of 647254253 is about 25441.1920514743. The cubic root of 647254253 is about 865.0176538658.

The spelling of 647254253 in words is "six hundred forty-seven million, two hundred fifty-four thousand, two hundred fifty-three".