640832519 has 2 divisors, whose sum is σ = 640832520. Its totient is φ = 640832518.

The previous prime is 640832497. The next prime is 640832557. The reversal of 640832519 is 915238046.

It is a happy number.

It is an a-pointer prime, because the next prime (640832557) can be obtained adding 640832519 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640832519 - 2²⁰ = 639783943 is a prime.

It is a super-2 number, since 2×640832519² = 821332634815770722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640832579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320416259 + 320416260.

It is an arithmetic number, because the mean of its divisors is an integer number (320416260).

Almost surely, 2^640832519 is an apocalyptic number.

640832519 is a deficient number, since it is larger than the sum of its proper divisors (1).

640832519 is an equidigital number, since it uses as much as digits as its factorization.

640832519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 640832519 is about 25314.6700353767. The cubic root of 640832519 is about 862.1473824003.

The spelling of 640832519 in words is "six hundred forty million, eight hundred thirty-two thousand, five hundred nineteen".