451872109 has 4 divisors (see below), whose sum is σ = 486631516. Its totient is φ = 417112704.

The previous prime is 451872101. The next prime is 451872119. The reversal of 451872109 is 901278154.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113422500 + 338449609 = 10650^2 + 18397^2 .

It is a cyclic number.

It is not a de Polignac number, because 451872109 - 2³ = 451872101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451872101) 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 3 ways as a sum of consecutive naturals, for example, 17379684 + ... + 17379709.

It is an arithmetic number, because the mean of its divisors is an integer number (121657879).

Almost surely, 2^451872109 is an apocalyptic number.

It is an amenable number.

451872109 is a deficient number, since it is larger than the sum of its proper divisors (34759407).

451872109 is a wasteful number, since it uses less digits than its factorization.

451872109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34759406.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 451872109 is about 21257.2836693685. The cubic root of 451872109 is about 767.3706397433.

The spelling of 451872109 in words is "four hundred fifty-one million, eight hundred seventy-two thousand, one hundred nine".