100043131 has 2 divisors, whose sum is σ = 100043132. Its totient is φ = 100043130.

The previous prime is 100043129. The next prime is 100043149. The reversal of 100043131 is 131340001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100043131 - 2¹ = 100043129 is a prime.

It is a super-2 number, since 2×100043131² = 20017256120566322, which contains 22 as substring.

Together with 100043129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (100043191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50021565 + 50021566.

It is an arithmetic number, because the mean of its divisors is an integer number (50021566).

Almost surely, 2^100043131 is an apocalyptic number.

100043131 is a deficient number, since it is larger than the sum of its proper divisors (1).

100043131 is an equidigital number, since it uses as much as digits as its factorization.

100043131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 100043131 is about 10002.1563175147. The cubic root of 100043131 is about 464.2256058922.

Adding to 100043131 its reverse (131340001), we get a palindrome (231383132).

The spelling of 100043131 in words is "one hundred million, forty-three thousand, one hundred thirty-one".