640453351 has 2 divisors, whose sum is σ = 640453352. Its totient is φ = 640453350.

The previous prime is 640453343. The next prime is 640453361. The reversal of 640453351 is 153354046.

640453351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640453351 - 2³ = 640453343 is a 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 (640453361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320226675 + 320226676.

It is an arithmetic number, because the mean of its divisors is an integer number (320226676).

Almost surely, 2^640453351 is an apocalyptic number.

640453351 is a deficient number, since it is larger than the sum of its proper divisors (1).

640453351 is an equidigital number, since it uses as much as digits as its factorization.

640453351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 640453351 is about 25307.1798310282. The cubic root of 640453351 is about 861.9773103023.

The spelling of 640453351 in words is "six hundred forty million, four hundred fifty-three thousand, three hundred fifty-one".