653808949 has 2 divisors, whose sum is σ = 653808950. Its totient is φ = 653808948.

The previous prime is 653808931. The next prime is 653808979. The reversal of 653808949 is 949808356.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651168324 + 2640625 = 25518^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 653808949 - 2¹⁵ = 653776181 is a prime.

It is a super-2 number, since 2×653808949² = 854932283584969202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 653808896 and 653808905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (653808929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326904474 + 326904475.

It is an arithmetic number, because the mean of its divisors is an integer number (326904475).

Almost surely, 2^653808949 is an apocalyptic number.

It is an amenable number.

653808949 is a deficient number, since it is larger than the sum of its proper divisors (1).

653808949 is an equidigital number, since it uses as much as digits as its factorization.

653808949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 653808949 is about 25569.6880896111. The cubic root of 653808949 is about 867.9278420659.

The spelling of 653808949 in words is "six hundred fifty-three million, eight hundred eight thousand, nine hundred forty-nine".