653740819 has 2 divisors, whose sum is σ = 653740820. Its totient is φ = 653740818.

The previous prime is 653740817. The next prime is 653740837. The reversal of 653740819 is 918047356.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 653740819 - 2¹ = 653740817 is a prime.

It is a super-2 number, since 2×653740819² = 854754116853581522, which contains 22 as substring.

Together with 653740817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (653740817) 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, 326870409 + 326870410.

It is an arithmetic number, because the mean of its divisors is an integer number (326870410).

Almost surely, 2^653740819 is an apocalyptic number.

653740819 is a deficient number, since it is larger than the sum of its proper divisors (1).

653740819 is an equidigital number, since it uses as much as digits as its factorization.

653740819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 653740819 is about 25568.3558133878. The cubic root of 653740819 is about 867.8976936165.

The spelling of 653740819 in words is "six hundred fifty-three million, seven hundred forty thousand, eight hundred nineteen".