100531420 has 48 divisors (see below), whose sum is σ = 235686528. Its totient is φ = 35703360.

The previous prime is 100531397. The next prime is 100531427. The reversal of 100531420 is 24135001.

It is a junction number, because it is equal to n+sod(n) for n = 100531394 and 100531403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100531427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4147 + ... + 14773.

It is an arithmetic number, because the mean of its divisors is an integer number (4910136).

Almost surely, 2^100531420 is an apocalyptic number.

100531420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100531420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117843264).

100531420 is an abundant number, since it is smaller than the sum of its proper divisors (135155108).

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

100531420 is a wasteful number, since it uses less digits than its factorization.

100531420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10690 (or 10688 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 100531420 is about 10026.5357925856. The cubic root of 100531420 is about 464.9796422274.

Adding to 100531420 its reverse (24135001), we get a palindrome (124666421).

The spelling of 100531420 in words is "one hundred million, five hundred thirty-one thousand, four hundred twenty".