101920985 has 4 divisors (see below), whose sum is σ = 122305188. Its totient is φ = 81536784.

The previous prime is 101920979. The next prime is 101920991. The reversal of 101920985 is 589029101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589029101 = 18713 ⋅31477.

It is an interprime number because it is at equal distance from previous prime (101920979) and next prime (101920991).

It can be written as a sum of positive squares in 2 ways, for example, as 10316944 + 91604041 = 3212^2 + 9571^2 .

It is a cyclic number.

It is not a de Polignac number, because 101920985 - 2¹⁸ = 101658841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10192094 + ... + 10192103.

It is an arithmetic number, because the mean of its divisors is an integer number (30576297).

Almost surely, 2^101920985 is an apocalyptic number.

It is an amenable number.

101920985 is a deficient number, since it is larger than the sum of its proper divisors (20384203).

101920985 is an equidigital number, since it uses as much as digits as its factorization.

101920985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20384202.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 101920985 is about 10095.5923550825. The cubic root of 101920985 is about 467.1121932846.

The spelling of 101920985 in words is "one hundred one million, nine hundred twenty thousand, nine hundred eighty-five".