653436409 has 2 divisors, whose sum is σ = 653436410. Its totient is φ = 653436408.

The previous prime is 653436401. The next prime is 653436419. The reversal of 653436409 is 904634356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 450288400 + 203148009 = 21220^2 + 14253^2 .

It is a cyclic number.

It is not a de Polignac number, because 653436409 - 2³ = 653436401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (653436401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326718204 + 326718205.

It is an arithmetic number, because the mean of its divisors is an integer number (326718205).

Almost surely, 2^653436409 is an apocalyptic number.

It is an amenable number.

653436409 is a deficient number, since it is larger than the sum of its proper divisors (1).

653436409 is an equidigital number, since it uses as much as digits as its factorization.

653436409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 40.

The square root of 653436409 is about 25562.4022540918. The cubic root of 653436409 is about 867.7629624678.

The spelling of 653436409 in words is "six hundred fifty-three million, four hundred thirty-six thousand, four hundred nine".