645143179 has 2 divisors, whose sum is σ = 645143180. Its totient is φ = 645143178.

The previous prime is 645143173. The next prime is 645143209. The reversal of 645143179 is 971341546.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645143179 is a prime.

It is not a weakly prime, because it can be changed into another prime (645143173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322571589 + 322571590.

It is an arithmetic number, because the mean of its divisors is an integer number (322571590).

Almost surely, 2^645143179 is an apocalyptic number.

645143179 is a deficient number, since it is larger than the sum of its proper divisors (1).

645143179 is an equidigital number, since it uses as much as digits as its factorization.

645143179 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 645143179 is about 25399.6688757944. The cubic root of 645143179 is about 864.0761870367.

The spelling of 645143179 in words is "six hundred forty-five million, one hundred forty-three thousand, one hundred seventy-nine".