640090159 has 2 divisors, whose sum is σ = 640090160. Its totient is φ = 640090158.

The previous prime is 640090147. The next prime is 640090211. The reversal of 640090159 is 951090046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640090159 - 2⁵ = 640090127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640093159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320045079 + 320045080.

It is an arithmetic number, because the mean of its divisors is an integer number (320045080).

Almost surely, 2^640090159 is an apocalyptic number.

640090159 is a deficient number, since it is larger than the sum of its proper divisors (1).

640090159 is an equidigital number, since it uses as much as digits as its factorization.

640090159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 640090159 is about 25300.0031422923. The cubic root of 640090159 is about 861.8143411287.

The spelling of 640090159 in words is "six hundred forty million, ninety thousand, one hundred fifty-nine".