102020099989 has 2 divisors, whose sum is σ = 102020099990. Its totient is φ = 102020099988.

The previous prime is 102020099947. The next prime is 102020100071. The reversal of 102020099989 is 989990020201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99215550225 + 2804549764 = 314985^2 + 52958^2 .

It is a cyclic number.

It is not a de Polignac number, because 102020099989 - 2⁷ = 102020099861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102020099939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010049994 + 51010049995.

It is an arithmetic number, because the mean of its divisors is an integer number (51010049995).

Almost surely, 2^102020099989 is an apocalyptic number.

It is an amenable number.

102020099989 is a deficient number, since it is larger than the sum of its proper divisors (1).

102020099989 is an equidigital number, since it uses as much as digits as its factorization.

102020099989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 49.

The spelling of 102020099989 in words is "one hundred two billion, twenty million, ninety-nine thousand, nine hundred eighty-nine".