102001001989 has 4 divisors (see below), whose sum is σ = 102380188140. Its totient is φ = 101621815840.

The previous prime is 102001001911. The next prime is 102001002023. The reversal of 102001001989 is 989100100201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12470188900 + 89530813089 = 111670^2 + 299217^2 .

It is a cyclic number.

It is not a de Polignac number, because 102001001989 - 2¹¹ = 102000999941 is a prime.

It is a super-2 number, since 2×102001001989² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102001001989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001001189) 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 in 3 ways as a sum of consecutive naturals, for example, 189592672 + ... + 189593209.

It is an arithmetic number, because the mean of its divisors is an integer number (25595047035).

Almost surely, 2^102001001989 is an apocalyptic number.

It is an amenable number.

102001001989 is a deficient number, since it is larger than the sum of its proper divisors (379186151).

102001001989 is an equidigital number, since it uses as much as digits as its factorization.

102001001989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379186150.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 102001001989 in words is "one hundred two billion, one million, one thousand, nine hundred eighty-nine".