447991 has 2 divisors, whose sum is σ = 447992. Its totient is φ = 447990.

The previous prime is 447983. The next prime is 448003. The reversal of 447991 is 199744.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 447991 - 2³ = 447983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (447901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223995 + 223996.

It is an arithmetic number, because the mean of its divisors is an integer number (223996).

2⁴⁴⁷⁹⁹¹ is an apocalyptic number.

447991 is a deficient number, since it is larger than the sum of its proper divisors (1).

447991 is an equidigital number, since it uses as much as digits as its factorization.

447991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 447991 is about 669.3212980326. The cubic root of 447991 is about 76.5167349152.

The spelling of 447991 in words is "four hundred forty-seven thousand, nine hundred ninety-one".