620139791 has 2 divisors, whose sum is σ = 620139792. Its totient is φ = 620139790.

The previous prime is 620139757. The next prime is 620139827. The reversal of 620139791 is 197931026.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 620139791 - 2¹⁴ = 620123407 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620139491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310069895 + 310069896.

It is an arithmetic number, because the mean of its divisors is an integer number (310069896).

Almost surely, 2^620139791 is an apocalyptic number.

620139791 is a deficient number, since it is larger than the sum of its proper divisors (1).

620139791 is an equidigital number, since it uses as much as digits as its factorization.

620139791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 620139791 is about 24902.6061085984. The cubic root of 620139791 is about 852.7659795612.

The spelling of 620139791 in words is "six hundred twenty million, one hundred thirty-nine thousand, seven hundred ninety-one".