451921 has 2 divisors, whose sum is σ = 451922. Its totient is φ = 451920.

The previous prime is 451909. The next prime is 451933. The reversal of 451921 is 129154.

It is a balanced prime because it is at equal distance from previous prime (451909) and next prime (451933).

It can be written as a sum of positive squares in only one way, i.e., 440896 + 11025 = 664^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 451921 - 2⁷ = 451793 is a prime.

451921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 451892 and 451901.

It is not a weakly prime, because it can be changed into another prime (451901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225960 + 225961.

It is an arithmetic number, because the mean of its divisors is an integer number (225961).

2⁴⁵¹⁹²¹ is an apocalyptic number.

It is an amenable number.

451921 is a deficient number, since it is larger than the sum of its proper divisors (1).

451921 is an equidigital number, since it uses as much as digits as its factorization.

451921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 22.

The square root of 451921 is about 672.2506972849. The cubic root of 451921 is about 76.7398314362.

The spelling of 451921 in words is "four hundred fifty-one thousand, nine hundred twenty-one".