640034971 has 2 divisors, whose sum is σ = 640034972. Its totient is φ = 640034970.

The previous prime is 640034963. The next prime is 640034977. The reversal of 640034971 is 179430046.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640034971 - 2³ = 640034963 is a prime.

It is not a weakly prime, because it can be changed into another prime (640034977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320017485 + 320017486.

It is an arithmetic number, because the mean of its divisors is an integer number (320017486).

Almost surely, 2^640034971 is an apocalyptic number.

640034971 is a deficient number, since it is larger than the sum of its proper divisors (1).

640034971 is an equidigital number, since it uses as much as digits as its factorization.

640034971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 640034971 is about 25298.9124469808. The cubic root of 640034971 is about 861.7895721301.

The spelling of 640034971 in words is "six hundred forty million, thirty-four thousand, nine hundred seventy-one".