101985281 has 4 divisors (see below), whose sum is σ = 102014292. Its totient is φ = 101956272.

The previous prime is 101985277. The next prime is 101985313. The reversal of 101985281 is 182589101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182589101 = 31 ⋅5889971.

It can be written as a sum of positive squares in 2 ways, for example, as 56490256 + 45495025 = 7516^2 + 6745^2 .

It is a cyclic number.

It is not a de Polignac number, because 101985281 - 2² = 101985277 is a prime.

It is a super-2 number, since 2×101985281² = 20801995081297922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101985211) 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, 8366 + ... + 16551.

It is an arithmetic number, because the mean of its divisors is an integer number (25503573).

Almost surely, 2^101985281 is an apocalyptic number.

It is an amenable number.

101985281 is a deficient number, since it is larger than the sum of its proper divisors (29011).

101985281 is an equidigital number, since it uses as much as digits as its factorization.

101985281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29010.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 101985281 is about 10098.7762129874. The cubic root of 101985281 is about 467.2103972424.

The spelling of 101985281 in words is "one hundred one million, nine hundred eighty-five thousand, two hundred eighty-one".