450991 has 2 divisors, whose sum is σ = 450992. Its totient is φ = 450990.

The previous prime is 450971. The next prime is 450997. The reversal of 450991 is 199054.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 450991 - 2⁹ = 450479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (450997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225495 + 225496.

It is an arithmetic number, because the mean of its divisors is an integer number (225496).

2⁴⁵⁰⁹⁹¹ is an apocalyptic number.

450991 is a deficient number, since it is larger than the sum of its proper divisors (1).

450991 is an equidigital number, since it uses as much as digits as its factorization.

450991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 450991 is about 671.5586348190. The cubic root of 450991 is about 76.6871547848.

It can be divided in two parts, 450 and 991, that added together give a palindrome (1441).

The spelling of 450991 in words is "four hundred fifty thousand, nine hundred ninety-one".