100127945 has 16 divisors (see below), whose sum is σ = 124241040. Its totient is φ = 77414400.

The previous prime is 100127941. The next prime is 100127969. The reversal of 100127945 is 549721001.

It can be written as a sum of positive squares in 8 ways, for example, as 1006009 + 99121936 = 1003^2 + 9956^2 .

It is not a de Polignac number, because 100127945 - 2² = 100127941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100127941) 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 in 15 ways as a sum of consecutive naturals, for example, 20105 + ... + 24585.

It is an arithmetic number, because the mean of its divisors is an integer number (7765065).

Almost surely, 2^100127945 is an apocalyptic number.

It is an amenable number.

100127945 is a deficient number, since it is larger than the sum of its proper divisors (24113095).

100127945 is a wasteful number, since it uses less digits than its factorization.

100127945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 100127945 is about 10006.3952050676. The cubic root of 100127945 is about 464.3567550241.

Adding to 100127945 its reverse (549721001), we get a palindrome (649848946).

The spelling of 100127945 in words is "one hundred million, one hundred twenty-seven thousand, nine hundred forty-five".