100720251 has 24 divisors (see below), whose sum is σ = 148708560. Its totient is φ = 65676096.

The previous prime is 100720183. The next prime is 100720259. The reversal of 100720251 is 152027001.

It is not a de Polignac number, because 100720251 - 2¹¹ = 100718203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100720259) 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, 80805 + ... + 82041.

It is an arithmetic number, because the mean of its divisors is an integer number (6196190).

Almost surely, 2^100720251 is an apocalyptic number.

100720251 is a deficient number, since it is larger than the sum of its proper divisors (47988309).

100720251 is a wasteful number, since it uses less digits than its factorization.

100720251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435 (or 1432 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 100720251 is about 10035.9479372902. The cubic root of 100720251 is about 465.2705882623.

Adding to 100720251 its reverse (152027001), we get a palindrome (252747252).

The spelling of 100720251 in words is "one hundred million, seven hundred twenty thousand, two hundred fifty-one".