101990242 has 16 divisors (see below), whose sum is σ = 162889272. Its totient is φ = 47727360.

The previous prime is 101990227. The next prime is 101990243. The reversal of 101990242 is 242099101.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 79227801 + 22762441 = 8901^2 + 4771^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 101990242.

It is not an unprimeable number, because it can be changed into a prime (101990243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2133 + ... + 14440.

Almost surely, 2^101990242 is an apocalyptic number.

101990242 is a deficient number, since it is larger than the sum of its proper divisors (60899030).

101990242 is a wasteful number, since it uses less digits than its factorization.

101990242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16773.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 101990242 is about 10099.0218338213. The cubic root of 101990242 is about 467.2179728232.

The spelling of 101990242 in words is "one hundred one million, nine hundred ninety thousand, two hundred forty-two".