646323547 has 2 divisors, whose sum is σ = 646323548. Its totient is φ = 646323546.

The previous prime is 646323479. The next prime is 646323571. The reversal of 646323547 is 745323646.

646323547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646323547 is a prime.

It is a super-2 number, since 2×646323547² = 835468254813322418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646323047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323161773 + 323161774.

It is an arithmetic number, because the mean of its divisors is an integer number (323161774).

Almost surely, 2^646323547 is an apocalyptic number.

646323547 is a deficient number, since it is larger than the sum of its proper divisors (1).

646323547 is an equidigital number, since it uses as much as digits as its factorization.

646323547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 40.

The square root of 646323547 is about 25422.8941507453. The cubic root of 646323547 is about 864.6028435051.

Subtracting 646323547 from its reverse (745323646), we obtain a palindrome (99000099).

The spelling of 646323547 in words is "six hundred forty-six million, three hundred twenty-three thousand, five hundred forty-seven".