653673217 has 4 divisors (see below), whose sum is σ = 656385796. Its totient is φ = 650960640.

The previous prime is 653673197. The next prime is 653673277. The reversal of 653673217 is 712376356.

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 319551376 + 334121841 = 17876^2 + 18279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-653673217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 653673217.

It is not an unprimeable number, because it can be changed into a prime (653673277) 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, 1355928 + ... + 1356409.

It is an arithmetic number, because the mean of its divisors is an integer number (164096449).

Almost surely, 2^653673217 is an apocalyptic number.

It is an amenable number.

653673217 is a deficient number, since it is larger than the sum of its proper divisors (2712579).

653673217 is a wasteful number, since it uses less digits than its factorization.

653673217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712578.

The product of its digits is 158760, while the sum is 40.

The square root of 653673217 is about 25567.0337935397. The cubic root of 653673217 is about 867.8677767440.

The spelling of 653673217 in words is "six hundred fifty-three million, six hundred seventy-three thousand, two hundred seventeen".