101644989 has 8 divisors (see below), whose sum is σ = 143498880. Its totient is φ = 63777216.

The previous prime is 101644987. The next prime is 101644997. The reversal of 101644989 is 989446101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 101644989 - 2¹ = 101644987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101644989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101644987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 996469 + ... + 996570.

It is an arithmetic number, because the mean of its divisors is an integer number (17937360).

Almost surely, 2^101644989 is an apocalyptic number.

It is an amenable number.

101644989 is a deficient number, since it is larger than the sum of its proper divisors (41853891).

101644989 is a wasteful number, since it uses less digits than its factorization.

101644989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993059.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 101644989 is about 10081.9139551972. The cubic root of 101644989 is about 466.6901747228.

The spelling of 101644989 in words is "one hundred one million, six hundred forty-four thousand, nine hundred eighty-nine".