653978317 has 2 divisors, whose sum is σ = 653978318. Its totient is φ = 653978316.

The previous prime is 653978261. The next prime is 653978341. The reversal of 653978317 is 713879356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582305161 + 71673156 = 24131^2 + 8466^2 .

It is a cyclic number.

It is not a de Polignac number, because 653978317 - 2⁷ = 653978189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (653978417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326989158 + 326989159.

It is an arithmetic number, because the mean of its divisors is an integer number (326989159).

Almost surely, 2^653978317 is an apocalyptic number.

It is an amenable number.

653978317 is a deficient number, since it is larger than the sum of its proper divisors (1).

653978317 is an equidigital number, since it uses as much as digits as its factorization.

653978317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 49.

The square root of 653978317 is about 25572.9997653775. Note that the first 3 decimals coincide. The cubic root of 653978317 is about 868.0027806299.

The spelling of 653978317 in words is "six hundred fifty-three million, nine hundred seventy-eight thousand, three hundred seventeen".