101995988 has 24 divisors (see below), whose sum is σ = 189364392. Its totient is φ = 47903744.

The previous prime is 101995981. The next prime is 101995991. The reversal of 101995988 is 889599101.

It can be written as a sum of positive squares in 4 ways, for example, as 14348944 + 87647044 = 3788^2 + 9362^2 .

It is a super-2 number, since 2×101995988² = 20806363136192288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101995981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43256 + ... + 45552.

It is an arithmetic number, because the mean of its divisors is an integer number (7890183).

Almost surely, 2^101995988 is an apocalyptic number.

It is an amenable number.

101995988 is a deficient number, since it is larger than the sum of its proper divisors (87368404).

101995988 is a wasteful number, since it uses less digits than its factorization.

101995988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971 (or 2969 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 50.

The square root of 101995988 is about 10099.3063128118. The cubic root of 101995988 is about 467.2267468131.

The spelling of 101995988 in words is "one hundred one million, nine hundred ninety-five thousand, nine hundred eighty-eight".