653997257 has 4 divisors (see below), whose sum is σ = 654640080. Its totient is φ = 653354436.

The previous prime is 653997221. The next prime is 653997269. The reversal of 653997257 is 752799356.

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 653997257 - 2⁶ = 653997193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 653997199 and 653997208.

It is not an unprimeable number, because it can be changed into a prime (653996257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319883 + ... + 321920.

It is an arithmetic number, because the mean of its divisors is an integer number (163660020).

Almost surely, 2^653997257 is an apocalyptic number.

It is an amenable number.

653997257 is a deficient number, since it is larger than the sum of its proper divisors (642823).

653997257 is a wasteful number, since it uses less digits than its factorization.

653997257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642822.

The product of its digits is 3572100, while the sum is 53.

The square root of 653997257 is about 25573.3700751387. The cubic root of 653997257 is about 868.0111600178.

The spelling of 653997257 in words is "six hundred fifty-three million, nine hundred ninety-seven thousand, two hundred fifty-seven".