643497141 has 16 divisors (see below), whose sum is σ = 1038248064. Its totient is φ = 346082304.

The previous prime is 643497139. The next prime is 643497167. The reversal of 643497141 is 141794346.

It is not a de Polignac number, because 643497141 - 2¹ = 643497139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643497141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643497121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 900900 + ... + 901613.

It is an arithmetic number, because the mean of its divisors is an integer number (64890504).

Almost surely, 2^643497141 is an apocalyptic number.

It is an amenable number.

643497141 is a deficient number, since it is larger than the sum of its proper divisors (394750923).

643497141 is a wasteful number, since it uses less digits than its factorization.

643497141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802540.

The product of its digits is 72576, while the sum is 39.

The square root of 643497141 is about 25367.2454357977. The cubic root of 643497141 is about 863.3406843670.

The spelling of 643497141 in words is "six hundred forty-three million, four hundred ninety-seven thousand, one hundred forty-one".