10123209989 has 2 divisors, whose sum is σ = 10123209990. Its totient is φ = 10123209988.

The previous prime is 10123209959. The next prime is 10123210067. The reversal of 10123209989 is 98990232101.

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., 9739716100 + 383493889 = 98690^2 + 19583^2 .

It is a cyclic number.

It is not a de Polignac number, because 10123209989 - 2²⁴ = 10106432773 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 (10123209959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5061604994 + 5061604995.

It is an arithmetic number, because the mean of its divisors is an integer number (5061604995).

Almost surely, 2^10123209989 is an apocalyptic number.

It is an amenable number.

10123209989 is a deficient number, since it is larger than the sum of its proper divisors (1).

10123209989 is an equidigital number, since it uses as much as digits as its factorization.

10123209989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 10123209989 in words is "ten billion, one hundred twenty-three million, two hundred nine thousand, nine hundred eighty-nine".