640350541 has 4 divisors (see below), whose sum is σ = 651204000. Its totient is φ = 629497084.

The previous prime is 640350533. The next prime is 640350569. The reversal of 640350541 is 145053046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640350541 - 2³ = 640350533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640350241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5426641 + ... + 5426758.

It is an arithmetic number, because the mean of its divisors is an integer number (162801000).

Almost surely, 2^640350541 is an apocalyptic number.

It is an amenable number.

640350541 is a deficient number, since it is larger than the sum of its proper divisors (10853459).

640350541 is a wasteful number, since it uses less digits than its factorization.

640350541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10853458.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 640350541 is about 25305.1485077642. The cubic root of 640350541 is about 861.9311843148.

The spelling of 640350541 in words is "six hundred forty million, three hundred fifty thousand, five hundred forty-one".