101989845 has 48 divisors (see below), whose sum is σ = 184384512. Its totient is φ = 52093440.

The previous prime is 101989841. The next prime is 101989847. The reversal of 101989845 is 548989101.

It is not a de Polignac number, because 101989845 - 2² = 101989841 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 101989845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101989841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157312 + ... + 157958.

It is an arithmetic number, because the mean of its divisors is an integer number (3841344).

Almost surely, 2^101989845 is an apocalyptic number.

101989845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

101989845 is a deficient number, since it is larger than the sum of its proper divisors (82394667).

101989845 is a wasteful number, since it uses less digits than its factorization.

101989845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 101989845 is about 10099.0021784333. The cubic root of 101989845 is about 467.2173666025.

The spelling of 101989845 in words is "one hundred one million, nine hundred eighty-nine thousand, eight hundred forty-five".