647120501 has 2 divisors, whose sum is σ = 647120502. Its totient is φ = 647120500.

The previous prime is 647120497. The next prime is 647120519. The reversal of 647120501 is 105021746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392079601 + 255040900 = 19801^2 + 15970^2 .

It is a cyclic number.

It is not a de Polignac number, because 647120501 - 2² = 647120497 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647120531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323560250 + 323560251.

It is an arithmetic number, because the mean of its divisors is an integer number (323560251).

Almost surely, 2^647120501 is an apocalyptic number.

It is an amenable number.

647120501 is a deficient number, since it is larger than the sum of its proper divisors (1).

647120501 is an equidigital number, since it uses as much as digits as its factorization.

647120501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 647120501 is about 25438.5632652475. The cubic root of 647120501 is about 864.9580658389.

The spelling of 647120501 in words is "six hundred forty-seven million, one hundred twenty thousand, five hundred one".