100043145 has 24 divisors (see below), whose sum is σ = 173753736. Its totient is φ = 53250048.

The previous prime is 100043131. The next prime is 100043149. The reversal of 100043145 is 541340001.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 72386064 + 27657081 = 8508^2 + 5259^2 .

It is not a de Polignac number, because 100043145 - 2⁴ = 100043129 is a prime.

It is a super-2 number, since 2×100043145² = 20017261722982050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100043149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24039 + ... + 27891.

It is an arithmetic number, because the mean of its divisors is an integer number (7239739).

Almost surely, 2^100043145 is an apocalyptic number.

100043145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100043145 is a deficient number, since it is larger than the sum of its proper divisors (73710591).

100043145 is a wasteful number, since it uses less digits than its factorization.

100043145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441 (or 4438 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 100043145 is about 10002.1570173638. The cubic root of 100043145 is about 464.2256275467.

Adding to 100043145 its reverse (541340001), we get a palindrome (641383146).

The spelling of 100043145 in words is "one hundred million, forty-three thousand, one hundred forty-five".