451639649 has 16 divisors (see below), whose sum is σ = 481650000. Its totient is φ = 422682624.

The previous prime is 451639637. The next prime is 451639679. The reversal of 451639649 is 946936154.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2496400 + 449143249 = 1580^2 + 21193^2 .

It is a cyclic number.

It is not a de Polignac number, because 451639649 - 2¹² = 451635553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (451639619) 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, 360977 + ... + 362225.

It is an arithmetic number, because the mean of its divisors is an integer number (30103125).

Almost surely, 2^451639649 is an apocalyptic number.

It is an amenable number.

451639649 is a deficient number, since it is larger than the sum of its proper divisors (30010351).

451639649 is a wasteful number, since it uses less digits than its factorization.

451639649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652.

The product of its digits is 699840, while the sum is 47.

The square root of 451639649 is about 21251.8151930606. The cubic root of 451639649 is about 767.2390290707.

The spelling of 451639649 in words is "four hundred fifty-one million, six hundred thirty-nine thousand, six hundred forty-nine".