647046823 has 2 divisors, whose sum is σ = 647046824. Its totient is φ = 647046822.

The previous prime is 647046761. The next prime is 647046853. The reversal of 647046823 is 328640746.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647046823 - 2¹⁷ = 646915751 is a prime.

It is equal to p_33647764 and since 647046823 and 33647764 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647046853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323523411 + 323523412.

It is an arithmetic number, because the mean of its divisors is an integer number (323523412).

Almost surely, 2^647046823 is an apocalyptic number.

647046823 is a deficient number, since it is larger than the sum of its proper divisors (1).

647046823 is an equidigital number, since it uses as much as digits as its factorization.

647046823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 647046823 is about 25437.1150683406. The cubic root of 647046823 is about 864.9252379503.

The spelling of 647046823 in words is "six hundred forty-seven million, forty-six thousand, eight hundred twenty-three".