646324051 has 2 divisors, whose sum is σ = 646324052. Its totient is φ = 646324050.

The previous prime is 646324033. The next prime is 646324057. The reversal of 646324051 is 150423646.

646324051 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 not a de Polignac number, because 646324051 - 2¹¹ = 646322003 is a prime.

It is not a weakly prime, because it can be changed into another prime (646324057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323162025 + 323162026.

It is an arithmetic number, because the mean of its divisors is an integer number (323162026).

Almost surely, 2^646324051 is an apocalyptic number.

646324051 is a deficient number, since it is larger than the sum of its proper divisors (1).

646324051 is an equidigital number, since it uses as much as digits as its factorization.

646324051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 646324051 is about 25422.9040630688. The cubic root of 646324051 is about 864.6030682427.

Adding to 646324051 its reverse (150423646), we get a palindrome (796747697).

The spelling of 646324051 in words is "six hundred forty-six million, three hundred twenty-four thousand, fifty-one".