653438561 has 2 divisors, whose sum is σ = 653438562. Its totient is φ = 653438560.

The previous prime is 653438551. The next prime is 653438567. The reversal of 653438561 is 165834356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 515517025 + 137921536 = 22705^2 + 11744^2 .

It is a cyclic number.

It is not a de Polignac number, because 653438561 - 2⁶ = 653438497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (653438567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326719280 + 326719281.

It is an arithmetic number, because the mean of its divisors is an integer number (326719281).

Almost surely, 2^653438561 is an apocalyptic number.

It is an amenable number.

653438561 is a deficient number, since it is larger than the sum of its proper divisors (1).

653438561 is an equidigital number, since it uses as much as digits as its factorization.

653438561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 41.

The square root of 653438561 is about 25562.4443471277. Note that the first 3 decimals coincide. The cubic root of 653438561 is about 867.7639150847.

The spelling of 653438561 in words is "six hundred fifty-three million, four hundred thirty-eight thousand, five hundred sixty-one".