647241943 has 2 divisors, whose sum is σ = 647241944. Its totient is φ = 647241942.

The previous prime is 647241941. The next prime is 647241953. The reversal of 647241943 is 349142746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647241943 - 2¹ = 647241941 is a prime.

Together with 647241941, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 647241896 and 647241905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647241941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323620971 + 323620972.

It is an arithmetic number, because the mean of its divisors is an integer number (323620972).

Almost surely, 2^647241943 is an apocalyptic number.

647241943 is a deficient number, since it is larger than the sum of its proper divisors (1).

647241943 is an equidigital number, since it uses as much as digits as its factorization.

647241943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 647241943 is about 25440.9501198363. The cubic root of 647241943 is about 865.0121699648.

The spelling of 647241943 in words is "six hundred forty-seven million, two hundred forty-one thousand, nine hundred forty-three".