646350193 has 2 divisors, whose sum is σ = 646350194. Its totient is φ = 646350192.

The previous prime is 646350167. The next prime is 646350197. The reversal of 646350193 is 391053646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 457232689 + 189117504 = 21383^2 + 13752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646350193 is a prime.

It is a super-2 number, since 2×646350193² = 835537143982274498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646350197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323175096 + 323175097.

It is an arithmetic number, because the mean of its divisors is an integer number (323175097).

Almost surely, 2^646350193 is an apocalyptic number.

It is an amenable number.

646350193 is a deficient number, since it is larger than the sum of its proper divisors (1).

646350193 is an equidigital number, since it uses as much as digits as its factorization.

646350193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 646350193 is about 25423.4182005489. The cubic root of 646350193 is about 864.6147250108.

The spelling of 646350193 in words is "six hundred forty-six million, three hundred fifty thousand, one hundred ninety-three".