645405113 has 2 divisors, whose sum is σ = 645405114. Its totient is φ = 645405112.

The previous prime is 645405109. The next prime is 645405157. The reversal of 645405113 is 311504546.

It is a happy number.

645405113 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 can be written as a sum of positive squares in only one way, i.e., 555686329 + 89718784 = 23573^2 + 9472^2 .

It is a cyclic number.

It is not a de Polignac number, because 645405113 - 2² = 645405109 is a prime.

It is a super-3 number, since 3×645405113³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (645405413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322702556 + 322702557.

It is an arithmetic number, because the mean of its divisors is an integer number (322702557).

Almost surely, 2^645405113 is an apocalyptic number.

It is an amenable number.

645405113 is a deficient number, since it is larger than the sum of its proper divisors (1).

645405113 is an equidigital number, since it uses as much as digits as its factorization.

645405113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 645405113 is about 25404.8246008509. The cubic root of 645405113 is about 864.1931121449.

Adding to 645405113 its reverse (311504546), we get a palindrome (956909659).

The spelling of 645405113 in words is "six hundred forty-five million, four hundred five thousand, one hundred thirteen".