647642311 has 2 divisors, whose sum is σ = 647642312. Its totient is φ = 647642310.

The previous prime is 647642299. The next prime is 647642321. The reversal of 647642311 is 113246746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647642311 - 2⁵ = 647642279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647642321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323821155 + 323821156.

It is an arithmetic number, because the mean of its divisors is an integer number (323821156).

Almost surely, 2^647642311 is an apocalyptic number.

647642311 is a deficient number, since it is larger than the sum of its proper divisors (1).

647642311 is an equidigital number, since it uses as much as digits as its factorization.

647642311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 647642311 is about 25448.8174774389. The cubic root of 647642311 is about 865.1904916427.

The spelling of 647642311 in words is "six hundred forty-seven million, six hundred forty-two thousand, three hundred eleven".