646316187 has 16 divisors (see below), whose sum is σ = 961961088. Its totient is φ = 382596480.

The previous prime is 646316173. The next prime is 646316191. The reversal of 646316187 is 781613646.

It is not a de Polignac number, because 646316187 - 2⁴ = 646316171 is a prime.

It is a super-2 number, since 2×646316187² = 835449227156437938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646316107) 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 in 15 ways as a sum of consecutive naturals, for example, 226318 + ... + 229155.

It is an arithmetic number, because the mean of its divisors is an integer number (60122568).

Almost surely, 2^646316187 is an apocalyptic number.

646316187 is a deficient number, since it is larger than the sum of its proper divisors (315644901).

646316187 is a wasteful number, since it uses less digits than its factorization.

646316187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455530.

The product of its digits is 145152, while the sum is 42.

The square root of 646316187 is about 25422.7493989144. The cubic root of 646316187 is about 864.5995616085.

The spelling of 646316187 in words is "six hundred forty-six million, three hundred sixteen thousand, one hundred eighty-seven".