100443531 has 16 divisors (see below), whose sum is σ = 143402400. Its totient is φ = 62312448.

The previous prime is 100443527. The next prime is 100443587. The reversal of 100443531 is 135344001.

It is not a de Polignac number, because 100443531 - 2² = 100443527 is a prime.

It is a super-2 number, since 2×100443531² = 20177805839495922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 100443498 and 100443507.

It is not an unprimeable number, because it can be changed into a prime (100443521) 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, 6526 + ... + 15603.

It is an arithmetic number, because the mean of its divisors is an integer number (8962650).

Almost surely, 2^100443531 is an apocalyptic number.

100443531 is a deficient number, since it is larger than the sum of its proper divisors (42958869).

100443531 is a wasteful number, since it uses less digits than its factorization.

100443531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22238.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 100443531 is about 10022.1520144129. The cubic root of 100443531 is about 464.8441008193.

Adding to 100443531 its reverse (135344001), we get a palindrome (235787532).

The spelling of 100443531 in words is "one hundred million, four hundred forty-three thousand, five hundred thirty-one".