861055493 has 2 divisors, whose sum is σ = 861055494. Its totient is φ = 861055492.

The previous prime is 861055469. The next prime is 861055511. The reversal of 861055493 is 394550168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 829324804 + 31730689 = 28798^2 + 5633^2 .

It is a cyclic number.

It is not a de Polignac number, because 861055493 - 2²⁴ = 844278277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861055493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861055193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430527746 + 430527747.

It is an arithmetic number, because the mean of its divisors is an integer number (430527747).

Almost surely, 2^861055493 is an apocalyptic number.

It is an amenable number.

861055493 is a deficient number, since it is larger than the sum of its proper divisors (1).

861055493 is an equidigital number, since it uses as much as digits as its factorization.

861055493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 861055493 is about 29343.7470851969. The cubic root of 861055493 is about 951.3574290121.

The spelling of 861055493 in words is "eight hundred sixty-one million, fifty-five thousand, four hundred ninety-three".