85511421397 has 2 divisors, whose sum is σ = 85511421398. Its totient is φ = 85511421396.

The previous prime is 85511421379. The next prime is 85511421403. The reversal of 85511421397 is 79312411558.

Together with previous prime (85511421379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72633484036 + 12877937361 = 269506^2 + 113481^2 .

It is a cyclic number.

It is not a de Polignac number, because 85511421397 - 2⁷ = 85511421269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85511421367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42755710698 + 42755710699.

It is an arithmetic number, because the mean of its divisors is an integer number (42755710699).

Almost surely, 2^85511421397 is an apocalyptic number.

It is an amenable number.

85511421397 is a deficient number, since it is larger than the sum of its proper divisors (1).

85511421397 is an equidigital number, since it uses as much as digits as its factorization.

85511421397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 46.

The spelling of 85511421397 in words is "eighty-five billion, five hundred eleven million, four hundred twenty-one thousand, three hundred ninety-seven".