451691 has 2 divisors, whose sum is σ = 451692. Its totient is φ = 451690.

The previous prime is 451681. The next prime is 451699. The reversal of 451691 is 196154.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 451691 - 2¹⁴ = 435307 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 451691.

It is not a weakly prime, because it can be changed into another prime (451699) 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 as a sum of consecutive naturals, namely, 225845 + 225846.

It is an arithmetic number, because the mean of its divisors is an integer number (225846).

2⁴⁵¹⁶⁹¹ is an apocalyptic number.

451691 is a deficient number, since it is larger than the sum of its proper divisors (1).

451691 is an equidigital number, since it uses as much as digits as its factorization.

451691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 451691 is about 672.0796083798. The cubic root of 451691 is about 76.7268106086.

The spelling of 451691 in words is "four hundred fifty-one thousand, six hundred ninety-one".