640545141 has 8 divisors (see below), whose sum is σ = 854529984. Its totient is φ = 426795200.

The previous prime is 640545109. The next prime is 640545151. The reversal of 640545141 is 141545046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640545141 - 2⁵ = 640545109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640545099 and 640545108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640545151) 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 7 ways as a sum of consecutive naturals, for example, 52260 + ... + 63341.

It is an arithmetic number, because the mean of its divisors is an integer number (106816248).

Almost surely, 2^640545141 is an apocalyptic number.

It is an amenable number.

640545141 is a deficient number, since it is larger than the sum of its proper divisors (213984843).

640545141 is a wasteful number, since it uses less digits than its factorization.

640545141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117451.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 640545141 is about 25308.9932830210. The cubic root of 640545141 is about 862.0184879658.

The spelling of 640545141 in words is "six hundred forty million, five hundred forty-five thousand, one hundred forty-one".