999620027909 has 2 divisors, whose sum is σ = 999620027910. Its totient is φ = 999620027908.

The previous prime is 999620027897. The next prime is 999620027927. The reversal of 999620027909 is 909720026999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 757383797284 + 242236230625 = 870278^2 + 492175^2 .

It is a cyclic number.

It is not a de Polignac number, because 999620027909 - 2²⁴ = 999603250693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999620027929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499810013954 + 499810013955.

It is an arithmetic number, because the mean of its divisors is an integer number (499810013955).

Almost surely, 2^999620027909 is an apocalyptic number.

It is an amenable number.

999620027909 is a deficient number, since it is larger than the sum of its proper divisors (1).

999620027909 is an equidigital number, since it uses as much as digits as its factorization.

999620027909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9920232, while the sum is 62.

The spelling of 999620027909 in words is "nine hundred ninety-nine billion, six hundred twenty million, twenty-seven thousand, nine hundred nine".