447238991 has 2 divisors, whose sum is σ = 447238992.
Its totient is φ = 447238990.
The previous prime is 447238927. The next prime is 447238993. The reversal of 447238991 is 199832744.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 447238991 - 26 = 447238927 is a prime.
Together with 447238993, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (447238993) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223619495 + 223619496.
It is an arithmetic number, because the mean of its divisors is an integer number (223619496).
Almost surely, 2447238991 is an apocalyptic number.
447238991 is a deficient number, since it is larger than the sum of its proper divisors (1).
447238991 is an equidigital number, since it uses as much as digits as its factorization.
447238991 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 435456, while the sum is 47.
The square root of 447238991 is about 21148.0256998142.
The cubic root of 447238991 is about 764.7389662892.
The spelling of 447238991 in words is "four hundred forty-seven million, two hundred thirty-eight thousand, nine hundred ninety-one".