647478101 has 2 divisors, whose sum is σ = 647478102. Its totient is φ = 647478100.

The previous prime is 647478089. The next prime is 647478119. The reversal of 647478101 is 101874746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458388100 + 189090001 = 21410^2 + 13751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647478101 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647478301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323739050 + 323739051.

It is an arithmetic number, because the mean of its divisors is an integer number (323739051).

Almost surely, 2^647478101 is an apocalyptic number.

It is an amenable number.

647478101 is a deficient number, since it is larger than the sum of its proper divisors (1).

647478101 is an equidigital number, since it uses as much as digits as its factorization.

647478101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 647478101 is about 25445.5909933332. The cubic root of 647478101 is about 865.1173623153.

The spelling of 647478101 in words is "six hundred forty-seven million, four hundred seventy-eight thousand, one hundred one".