101439985 has 4 divisors (see below), whose sum is σ = 121727988. Its totient is φ = 81151984.

The previous prime is 101439983. The next prime is 101440013. The reversal of 101439985 is 589934101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589934101 = 71 ⋅8308931.

It can be written as a sum of positive squares in 2 ways, for example, as 16136289 + 85303696 = 4017^2 + 9236^2 .

It is a cyclic number.

It is not a de Polignac number, because 101439985 - 2¹ = 101439983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101439983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10143994 + ... + 10144003.

It is an arithmetic number, because the mean of its divisors is an integer number (30431997).

Almost surely, 2^101439985 is an apocalyptic number.

It is an amenable number.

101439985 is a deficient number, since it is larger than the sum of its proper divisors (20288003).

101439985 is an equidigital number, since it uses as much as digits as its factorization.

101439985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20288002.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 101439985 is about 10071.7419049537. The cubic root of 101439985 is about 466.3762135340.

The spelling of 101439985 in words is "one hundred one million, four hundred thirty-nine thousand, nine hundred eighty-five".