451439681 has 16 divisors (see below), whose sum is σ = 564109440. Its totient is φ = 350974080.

The previous prime is 451439663. The next prime is 451439683. The reversal of 451439681 is 186934154.

It is a cyclic number.

It is not a de Polignac number, because 451439681 - 2¹⁸ = 451177537 is a prime.

It is a super-2 number, since 2×451439681² = 407595571162763522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (451439683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28775 + ... + 41603.

It is an arithmetic number, because the mean of its divisors is an integer number (35256840).

Almost surely, 2^451439681 is an apocalyptic number.

It is an amenable number.

451439681 is a deficient number, since it is larger than the sum of its proper divisors (112669759).

451439681 is a wasteful number, since it uses less digits than its factorization.

451439681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13304.

The product of its digits is 103680, while the sum is 41.

The square root of 451439681 is about 21247.1099446489. The cubic root of 451439681 is about 767.1257780875.

The spelling of 451439681 in words is "four hundred fifty-one million, four hundred thirty-nine thousand, six hundred eighty-one".