653619949 has 2 divisors, whose sum is σ = 653619950. Its totient is φ = 653619948.

The previous prime is 653619943. The next prime is 653619971. The reversal of 653619949 is 949916356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521208900 + 132411049 = 22830^2 + 11507^2 .

It is a cyclic number.

It is not a de Polignac number, because 653619949 - 2⁷ = 653619821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 653619896 and 653619905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (653619943) 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, 326809974 + 326809975.

It is an arithmetic number, because the mean of its divisors is an integer number (326809975).

Almost surely, 2^653619949 is an apocalyptic number.

It is an amenable number.

653619949 is a deficient number, since it is larger than the sum of its proper divisors (1).

653619949 is an equidigital number, since it uses as much as digits as its factorization.

653619949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1574640, while the sum is 52.

The square root of 653619949 is about 25565.9920402084. The cubic root of 653619949 is about 867.8442018468.

The spelling of 653619949 in words is "six hundred fifty-three million, six hundred nineteen thousand, nine hundred forty-nine".