643106013 has 32 divisors (see below), whose sum is σ = 978324480. Its totient is φ = 371965440.

The previous prime is 643106011. The next prime is 643106017. The reversal of 643106013 is 310601346.

It is not a de Polignac number, because 643106013 - 2¹ = 643106011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643106011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 510178 + ... + 511436.

It is an arithmetic number, because the mean of its divisors is an integer number (30572640).

Almost surely, 2^643106013 is an apocalyptic number.

It is an amenable number.

643106013 is a deficient number, since it is larger than the sum of its proper divisors (335218467).

643106013 is a wasteful number, since it uses less digits than its factorization.

643106013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 643106013 is about 25359.5349523606. The cubic root of 643106013 is about 863.1657314253.

Adding to 643106013 its reverse (310601346), we get a palindrome (953707359).

The spelling of 643106013 in words is "six hundred forty-three million, one hundred six thousand, thirteen".