653164621 has 2 divisors, whose sum is σ = 653164622. Its totient is φ = 653164620.

The previous prime is 653164619. The next prime is 653164627. The reversal of 653164621 is 126461356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441462121 + 211702500 = 21011^2 + 14550^2 .

It is a cyclic number.

It is not a de Polignac number, because 653164621 - 2¹ = 653164619 is a prime.

Together with 653164619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (653164627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326582310 + 326582311.

It is an arithmetic number, because the mean of its divisors is an integer number (326582311).

Almost surely, 2^653164621 is an apocalyptic number.

It is an amenable number.

653164621 is a deficient number, since it is larger than the sum of its proper divisors (1).

653164621 is an equidigital number, since it uses as much as digits as its factorization.

653164621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 653164621 is about 25557.0855341528. The cubic root of 653164621 is about 867.6426343769.

The spelling of 653164621 in words is "six hundred fifty-three million, one hundred sixty-four thousand, six hundred twenty-one".