451631 has 4 divisors (see below), whose sum is σ = 458064. Its totient is φ = 445200.

The previous prime is 451621. The next prime is 451637. The reversal of 451631 is 136154.

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

It is a cyclic number.

It is not a de Polignac number, because 451631 - 2¹⁴ = 435247 is a prime.

It is a super-2 number, since 2×451631² = 407941120322, 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 (451637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3110 + ... + 3251.

It is an arithmetic number, because the mean of its divisors is an integer number (114516).

2⁴⁵¹⁶³¹ is an apocalyptic number.

451631 is a deficient number, since it is larger than the sum of its proper divisors (6433).

451631 is an equidigital number, since it uses as much as digits as its factorization.

451631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432.

The product of its digits is 360, while the sum is 20.

The square root of 451631 is about 672.0349693282. The cubic root of 451631 is about 76.7234131440.

Adding to 451631 its reverse (136154), we get a palindrome (587785).

The spelling of 451631 in words is "four hundred fifty-one thousand, six hundred thirty-one".