19071086861 has 2 divisors, whose sum is σ = 19071086862. Its totient is φ = 19071086860.

The previous prime is 19071086851. The next prime is 19071086891. The reversal of 19071086861 is 16868017091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14039880100 + 5031206761 = 118490^2 + 70931^2 .

It is a cyclic number.

It is not a de Polignac number, because 19071086861 - 2¹⁴ = 19071070477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19071086851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9535543430 + 9535543431.

It is an arithmetic number, because the mean of its divisors is an integer number (9535543431).

Almost surely, 2^19071086861 is an apocalyptic number.

It is an amenable number.

19071086861 is a deficient number, since it is larger than the sum of its proper divisors (1).

19071086861 is an equidigital number, since it uses as much as digits as its factorization.

19071086861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 47.

The spelling of 19071086861 in words is "nineteen billion, seventy-one million, eighty-six thousand, eight hundred sixty-one".