101231028 has 18 divisors (see below), whose sum is σ = 255889634. Its totient is φ = 33743664.

The previous prime is 101231021. The next prime is 101231029. The reversal of 101231028 is 820132101.

It can be written as a sum of positive squares in only one way, i.e., 99440784 + 1790244 = 9972^2 + 1338^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 101231028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101231021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1405951 + ... + 1406022.

Almost surely, 2^101231028 is an apocalyptic number.

101231028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

101231028 is an abundant number, since it is smaller than the sum of its proper divisors (154658606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101231028 is a wasteful number, since it uses less digits than its factorization.

101231028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811983 (or 2811978 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 101231028 is about 10061.3631283241. The cubic root of 101231028 is about 466.0557627585.

Adding to 101231028 its reverse (820132101), we get a palindrome (921363129).

The spelling of 101231028 in words is "one hundred one million, two hundred thirty-one thousand, twenty-eight".