861822427 has 2 divisors, whose sum is σ = 861822428. Its totient is φ = 861822426.

The previous prime is 861822341. The next prime is 861822431. The reversal of 861822427 is 724228168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861822427 - 2²⁷ = 727604699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861822427.

It is not a weakly prime, because it can be changed into another prime (861822487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430911213 + 430911214.

It is an arithmetic number, because the mean of its divisors is an integer number (430911214).

Almost surely, 2^861822427 is an apocalyptic number.

861822427 is a deficient number, since it is larger than the sum of its proper divisors (1).

861822427 is an equidigital number, since it uses as much as digits as its factorization.

861822427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 40.

The square root of 861822427 is about 29356.8122758586. The cubic root of 861822427 is about 951.6398002209.

The spelling of 861822427 in words is "eight hundred sixty-one million, eight hundred twenty-two thousand, four hundred twenty-seven".