451343981 has 16 divisors (see below), whose sum is σ = 498624000. Its totient is φ = 405140400.

The previous prime is 451343969. The next prime is 451344011. The reversal of 451343981 is 189343154.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-451343981 is a prime.

It is a super-2 number, since 2×451343981² = 407422778369856722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451343281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321920 + ... + 323318.

It is an arithmetic number, because the mean of its divisors is an integer number (31164000).

Almost surely, 2^451343981 is an apocalyptic number.

It is an amenable number.

451343981 is a deficient number, since it is larger than the sum of its proper divisors (47280019).

451343981 is a wasteful number, since it uses less digits than its factorization.

451343981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760.

The product of its digits is 51840, while the sum is 38.

The square root of 451343981 is about 21244.8577542896. The cubic root of 451343981 is about 767.0715669874.

The spelling of 451343981 in words is "four hundred fifty-one million, three hundred forty-three thousand, nine hundred eighty-one".