102444201989 has 2 divisors, whose sum is σ = 102444201990. Its totient is φ = 102444201988.

The previous prime is 102444201917. The next prime is 102444201991. The reversal of 102444201989 is 989102444201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98005311364 + 4438890625 = 313058^2 + 66625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102444201989 is a prime.

It is a super-2 number, since 2×102444201989² (a number of 23 digits) contains 22 as substring.

Together with 102444201991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102444201589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51222100994 + 51222100995.

It is an arithmetic number, because the mean of its divisors is an integer number (51222100995).

Almost surely, 2^102444201989 is an apocalyptic number.

It is an amenable number.

102444201989 is a deficient number, since it is larger than the sum of its proper divisors (1).

102444201989 is an equidigital number, since it uses as much as digits as its factorization.

102444201989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 102444201989 in words is "one hundred two billion, four hundred forty-four million, two hundred one thousand, nine hundred eighty-nine".