621050782109 has 2 divisors, whose sum is σ = 621050782110. Its totient is φ = 621050782108.

The previous prime is 621050782097. The next prime is 621050782127. The reversal of 621050782109 is 901287050126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 558872866084 + 62177916025 = 747578^2 + 249355^2 .

It is a cyclic number.

It is not a de Polignac number, because 621050782109 - 2²⁴ = 621034004893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621050782129) 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, 310525391054 + 310525391055.

It is an arithmetic number, because the mean of its divisors is an integer number (310525391055).

Almost surely, 2^621050782109 is an apocalyptic number.

It is an amenable number.

621050782109 is a deficient number, since it is larger than the sum of its proper divisors (1).

621050782109 is an equidigital number, since it uses as much as digits as its factorization.

621050782109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 621050782109 in words is "six hundred twenty-one billion, fifty million, seven hundred eighty-two thousand, one hundred nine".