861479123 has 2 divisors, whose sum is σ = 861479124. Its totient is φ = 861479122.

The previous prime is 861479107. The next prime is 861479261. The reversal of 861479123 is 321974168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861479123 - 2⁴ = 861479107 is a prime.

It is not a weakly prime, because it can be changed into another prime (861470123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430739561 + 430739562.

It is an arithmetic number, because the mean of its divisors is an integer number (430739562).

Almost surely, 2^861479123 is an apocalyptic number.

861479123 is a deficient number, since it is larger than the sum of its proper divisors (1).

861479123 is an equidigital number, since it uses as much as digits as its factorization.

861479123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 861479123 is about 29350.9646008440. The cubic root of 861479123 is about 951.5134226248.

The spelling of 861479123 in words is "eight hundred sixty-one million, four hundred seventy-nine thousand, one hundred twenty-three".