640371143 has 2 divisors, whose sum is σ = 640371144. Its totient is φ = 640371142.

The previous prime is 640371101. The next prime is 640371161. The reversal of 640371143 is 341173046.

640371143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640371143 - 2¹⁶ = 640305607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640373143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320185571 + 320185572.

It is an arithmetic number, because the mean of its divisors is an integer number (320185572).

Almost surely, 2^640371143 is an apocalyptic number.

640371143 is a deficient number, since it is larger than the sum of its proper divisors (1).

640371143 is an equidigital number, since it uses as much as digits as its factorization.

640371143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 640371143 is about 25305.5555758019. Note that the first 4 decimals coincide. The cubic root of 640371143 is about 861.9404278539.

The spelling of 640371143 in words is "six hundred forty million, three hundred seventy-one thousand, one hundred forty-three".