100043001 has 12 divisors (see below), whose sum is σ = 145140580. Its totient is φ = 66402720.

The previous prime is 100042991. The next prime is 100043003. The reversal of 100043001 is 100340001.

It can be written as a sum of positive squares in 2 ways, for example, as 42889401 + 57153600 = 6549^2 + 7560^2 .

It is not a de Polignac number, because 100043001 - 2¹¹ = 100040953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100043003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22210 + ... + 26331.

Almost surely, 2^100043001 is an apocalyptic number.

It is an amenable number.

100043001 is a deficient number, since it is larger than the sum of its proper divisors (45097579).

100043001 is a wasteful number, since it uses less digits than its factorization.

100043001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48776 (or 48773 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 100043001 is about 10002.1498189139. The cubic root of 100043001 is about 464.2254048144.

Adding to 100043001 its reverse (100340001), we get a palindrome (200383002).

The spelling of 100043001 in words is "one hundred million, forty-three thousand, one".