100644531 has 16 divisors (see below), whose sum is σ = 147592704. Its totient is φ = 60616224.

The previous prime is 100644497. The next prime is 100644601. The reversal of 100644531 is 135446001.

It is not a de Polignac number, because 100644531 - 2¹¹ = 100642483 is a prime.

It is a super-2 number, since 2×100644531² = 20258643240419922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100644331) 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, 25621 + ... + 29286.

It is an arithmetic number, because the mean of its divisors is an integer number (9224544).

Almost surely, 2^100644531 is an apocalyptic number.

100644531 is a deficient number, since it is larger than the sum of its proper divisors (46948173).

100644531 is a wasteful number, since it uses less digits than its factorization.

100644531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54970.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 100644531 is about 10032.1747891472. The cubic root of 100644531 is about 465.1539645088.

The spelling of 100644531 in words is "one hundred million, six hundred forty-four thousand, five hundred thirty-one".