620308391 has 2 divisors, whose sum is σ = 620308392. Its totient is φ = 620308390.

The previous prime is 620308387. The next prime is 620308421. The reversal of 620308391 is 193803026.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 620308391 - 2² = 620308387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620308301) 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, 310154195 + 310154196.

It is an arithmetic number, because the mean of its divisors is an integer number (310154196).

Almost surely, 2^620308391 is an apocalyptic number.

620308391 is a deficient number, since it is larger than the sum of its proper divisors (1).

620308391 is an equidigital number, since it uses as much as digits as its factorization.

620308391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 620308391 is about 24905.9910664081. The cubic root of 620308391 is about 852.8432542438.

The spelling of 620308391 in words is "six hundred twenty million, three hundred eight thousand, three hundred ninety-one".