647123461 has 2 divisors, whose sum is σ = 647123462. Its totient is φ = 647123460.

The previous prime is 647123447. The next prime is 647123501. The reversal of 647123461 is 164321746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595067236 + 52056225 = 24394^2 + 7215^2 .

It is a cyclic number.

It is not a de Polignac number, because 647123461 - 2⁷ = 647123333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647123161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323561730 + 323561731.

It is an arithmetic number, because the mean of its divisors is an integer number (323561731).

Almost surely, 2^647123461 is an apocalyptic number.

It is an amenable number.

647123461 is a deficient number, since it is larger than the sum of its proper divisors (1).

647123461 is an equidigital number, since it uses as much as digits as its factorization.

647123461 is an odious number, because the sum of its binary digits is odd.

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

The square root of 647123461 is about 25438.6214445673. The cubic root of 647123461 is about 864.9593846411.

The spelling of 647123461 in words is "six hundred forty-seven million, one hundred twenty-three thousand, four hundred sixty-one".