645411187 has 2 divisors, whose sum is σ = 645411188. Its totient is φ = 645411186.

The previous prime is 645411121. The next prime is 645411199. The reversal of 645411187 is 781114546.

645411187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645411187 - 2⁷ = 645411059 is a prime.

It is a super-3 number, since 3×645411187³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645411787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322705593 + 322705594.

It is an arithmetic number, because the mean of its divisors is an integer number (322705594).

Almost surely, 2^645411187 is an apocalyptic number.

645411187 is a deficient number, since it is larger than the sum of its proper divisors (1).

645411187 is an equidigital number, since it uses as much as digits as its factorization.

645411187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 37.

The square root of 645411187 is about 25404.9441447920. The cubic root of 645411187 is about 864.1958231515.

The spelling of 645411187 in words is "six hundred forty-five million, four hundred eleven thousand, one hundred eighty-seven".