645179 has 2 divisors, whose sum is σ = 645180. Its totient is φ = 645178.

The previous prime is 645149. The next prime is 645187. The reversal of 645179 is 971546.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645179 - 2⁸ = 644923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322589 + 322590.

It is an arithmetic number, because the mean of its divisors is an integer number (322590).

2⁶⁴⁵¹⁷⁹ is an apocalyptic number.

645179 is a deficient number, since it is larger than the sum of its proper divisors (1).

645179 is an equidigital number, since it uses as much as digits as its factorization.

645179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 645179 is about 803.2303530121. The cubic root of 645179 is about 86.4092179094.

The spelling of 645179 in words is "six hundred forty-five thousand, one hundred seventy-nine".