640594151 has 2 divisors, whose sum is σ = 640594152. Its totient is φ = 640594150.

The previous prime is 640594121. The next prime is 640594181. The reversal of 640594151 is 151495046.

It is a balanced prime because it is at equal distance from previous prime (640594121) and next prime (640594181).

It is a cyclic number.

It is not a de Polignac number, because 640594151 - 2²² = 636399847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640594121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320297075 + 320297076.

It is an arithmetic number, because the mean of its divisors is an integer number (320297076).

Almost surely, 2^640594151 is an apocalyptic number.

640594151 is a deficient number, since it is larger than the sum of its proper divisors (1).

640594151 is an equidigital number, since it uses as much as digits as its factorization.

640594151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 640594151 is about 25309.9614974026. The cubic root of 640594151 is about 862.0404725983.

The spelling of 640594151 in words is "six hundred forty million, five hundred ninety-four thousand, one hundred fifty-one".