100720451 has 12 divisors (see below), whose sum is σ = 112830480. Its totient is φ = 89762400.

The previous prime is 100720447. The next prime is 100720453. The reversal of 100720451 is 154027001.

100720451 = 1588² + 1589² + ... + 1626².

It is not a de Polignac number, because 100720451 - 2² = 100720447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100720453) 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, 5375 + ... + 15176.

It is an arithmetic number, because the mean of its divisors is an integer number (9402540).

Almost surely, 2^100720451 is an apocalyptic number.

100720451 is a deficient number, since it is larger than the sum of its proper divisors (12110029).

100720451 is a wasteful number, since it uses less digits than its factorization.

100720451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20606 (or 20593 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 100720451 is about 10035.9579014661. The cubic root of 100720451 is about 465.2708962244.

Adding to 100720451 its reverse (154027001), we get a palindrome (254747452).

The spelling of 100720451 in words is "one hundred million, seven hundred twenty thousand, four hundred fifty-one".