647354931749 has 2 divisors, whose sum is σ = 647354931750. Its totient is φ = 647354931748.

The previous prime is 647354931697. The next prime is 647354931763. The reversal of 647354931749 is 947139453746.

647354931749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630782231524 + 16572700225 = 794218^2 + 128735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647354931749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647354931691 and 647354931700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647354930749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323677465874 + 323677465875.

It is an arithmetic number, because the mean of its divisors is an integer number (323677465875).

Almost surely, 2^647354931749 is an apocalyptic number.

It is an amenable number.

647354931749 is a deficient number, since it is larger than the sum of its proper divisors (1).

647354931749 is an equidigital number, since it uses as much as digits as its factorization.

647354931749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68584320, while the sum is 62.

The spelling of 647354931749 in words is "six hundred forty-seven billion, three hundred fifty-four million, nine hundred thirty-one thousand, seven hundred forty-nine".