85810389391 has 2 divisors, whose sum is σ = 85810389392. Its totient is φ = 85810389390.

The previous prime is 85810389373. The next prime is 85810389433. The reversal of 85810389391 is 19398301858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85810389391 - 2¹⁵ = 85810356623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85810389341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42905194695 + 42905194696.

It is an arithmetic number, because the mean of its divisors is an integer number (42905194696).

Almost surely, 2^85810389391 is an apocalyptic number.

85810389391 is a deficient number, since it is larger than the sum of its proper divisors (1).

85810389391 is an equidigital number, since it uses as much as digits as its factorization.

85810389391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 55.

The spelling of 85810389391 in words is "eighty-five billion, eight hundred ten million, three hundred eighty-nine thousand, three hundred ninety-one".