653203997 has 2 divisors, whose sum is σ = 653203998. Its totient is φ = 653203996.

The previous prime is 653203987. The next prime is 653204003. The reversal of 653203997 is 799302356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588256516 + 64947481 = 24254^2 + 8059^2 .

It is a cyclic number.

It is not a de Polignac number, because 653203997 - 2⁴ = 653203981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (653203987) 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 as a sum of consecutive naturals, namely, 326601998 + 326601999.

It is an arithmetic number, because the mean of its divisors is an integer number (326601999).

Almost surely, 2^653203997 is an apocalyptic number.

It is an amenable number.

653203997 is a deficient number, since it is larger than the sum of its proper divisors (1).

653203997 is an equidigital number, since it uses as much as digits as its factorization.

653203997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 44.

The square root of 653203997 is about 25557.8558764228. The cubic root of 653203997 is about 867.6600692924.

The spelling of 653203997 in words is "six hundred fifty-three million, two hundred three thousand, nine hundred ninety-seven".