647636701 has 2 divisors, whose sum is σ = 647636702. Its totient is φ = 647636700.

The previous prime is 647636683. The next prime is 647636741. The reversal of 647636701 is 107636746.

It is an a-pointer prime, because the next prime (647636741) can be obtained adding 647636701 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 425596900 + 222039801 = 20630^2 + 14901^2 .

It is a cyclic number.

It is not a de Polignac number, because 647636701 - 2⁹ = 647636189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647636741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323818350 + 323818351.

It is an arithmetic number, because the mean of its divisors is an integer number (323818351).

Almost surely, 2^647636701 is an apocalyptic number.

It is an amenable number.

647636701 is a deficient number, since it is larger than the sum of its proper divisors (1).

647636701 is an equidigital number, since it uses as much as digits as its factorization.

647636701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 647636701 is about 25448.7072559688. The cubic root of 647636701 is about 865.1879934877.

The spelling of 647636701 in words is "six hundred forty-seven million, six hundred thirty-six thousand, seven hundred one".