643610411 has 4 divisors (see below), whose sum is σ = 644404824. Its totient is φ = 642816000.

The previous prime is 643610347. The next prime is 643610419. The reversal of 643610411 is 114016346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 114016346 = 2 ⋅57008173.

It is a cyclic number.

It is not a de Polignac number, because 643610411 - 2⁶ = 643610347 is a prime.

It is a super-2 number, since 2×643610411² = 828468722295177842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643610419) 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 3 ways as a sum of consecutive naturals, for example, 395990 + ... + 397611.

It is an arithmetic number, because the mean of its divisors is an integer number (161101206).

Almost surely, 2^643610411 is an apocalyptic number.

643610411 is a deficient number, since it is larger than the sum of its proper divisors (794413).

643610411 is an equidigital number, since it uses as much as digits as its factorization.

643610411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794412.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 643610411 is about 25369.4779410220. The cubic root of 643610411 is about 863.3913372013.

Adding to 643610411 its reverse (114016346), we get a palindrome (757626757).

The spelling of 643610411 in words is "six hundred forty-three million, six hundred ten thousand, four hundred eleven".