861945179 has 2 divisors, whose sum is σ = 861945180. Its totient is φ = 861945178.

The previous prime is 861945167. The next prime is 861945197. The reversal of 861945179 is 971549168.

Together with next prime (861945197) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861945179 is a prime.

It is not a weakly prime, because it can be changed into another prime (861945199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430972589 + 430972590.

It is an arithmetic number, because the mean of its divisors is an integer number (430972590).

Almost surely, 2^861945179 is an apocalyptic number.

861945179 is a deficient number, since it is larger than the sum of its proper divisors (1).

861945179 is an equidigital number, since it uses as much as digits as its factorization.

861945179 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 50.

The square root of 861945179 is about 29358.9028916273. The cubic root of 861945179 is about 951.6849797302.

The spelling of 861945179 in words is "eight hundred sixty-one million, nine hundred forty-five thousand, one hundred seventy-nine".