640146341 has 4 divisors (see below), whose sum is σ = 649700832. Its totient is φ = 630591852.

The previous prime is 640146323. The next prime is 640146343. The reversal of 640146341 is 143641046.

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 640146341 - 2⁶ = 640146277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640146343) 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, 4777145 + ... + 4777278.

It is an arithmetic number, because the mean of its divisors is an integer number (162425208).

Almost surely, 2^640146341 is an apocalyptic number.

It is an amenable number.

640146341 is a deficient number, since it is larger than the sum of its proper divisors (9554491).

640146341 is an equidigital number, since it uses as much as digits as its factorization.

640146341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9554490.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 640146341 is about 25301.1134339973. The cubic root of 640146341 is about 861.8395547835.

Adding to 640146341 its reverse (143641046), we get a palindrome (783787387).

The spelling of 640146341 in words is "six hundred forty million, one hundred forty-six thousand, three hundred forty-one".