643087197 has 12 divisors (see below), whose sum is σ = 944648640. Its totient is φ = 421457928.

The previous prime is 643087187. The next prime is 643087217. The reversal of 643087197 is 791780346.

It is not a de Polignac number, because 643087197 - 2¹⁵ = 643054429 is a prime.

It is a super-2 number, since 2×643087197² = 827122285890633618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643087187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 605013 + ... + 606074.

It is an arithmetic number, because the mean of its divisors is an integer number (78720720).

Almost surely, 2^643087197 is an apocalyptic number.

It is an amenable number.

643087197 is a deficient number, since it is larger than the sum of its proper divisors (301561443).

643087197 is a wasteful number, since it uses less digits than its factorization.

643087197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211152 (or 1211149 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 643087197 is about 25359.1639649260. The cubic root of 643087197 is about 863.1573131736.

The spelling of 643087197 in words is "six hundred forty-three million, eighty-seven thousand, one hundred ninety-seven".