447397861 has 2 divisors, whose sum is σ = 447397862. Its totient is φ = 447397860.

The previous prime is 447397831. The next prime is 447397879. The reversal of 447397861 is 168793744.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445421025 + 1976836 = 21105^2 + 1406^2 .

It is a cyclic number.

It is not a de Polignac number, because 447397861 - 2⁵ = 447397829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (447397831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223698930 + 223698931.

It is an arithmetic number, because the mean of its divisors is an integer number (223698931).

Almost surely, 2^447397861 is an apocalyptic number.

It is an amenable number.

447397861 is a deficient number, since it is larger than the sum of its proper divisors (1).

447397861 is an equidigital number, since it uses as much as digits as its factorization.

447397861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The square root of 447397861 is about 21151.7815088942. The cubic root of 447397861 is about 764.8295067675.

The spelling of 447397861 in words is "four hundred forty-seven million, three hundred ninety-seven thousand, eight hundred sixty-one".