85874351989 has 2 divisors, whose sum is σ = 85874351990. Its totient is φ = 85874351988.

The previous prime is 85874351963. The next prime is 85874351999. The reversal of 85874351989 is 98915347858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83697383025 + 2176968964 = 289305^2 + 46658^2 .

It is a cyclic number.

It is not a de Polignac number, because 85874351989 - 2²¹ = 85872254837 is a prime.

It is a super-2 number, since 2×85874351989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85874351999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42937175994 + 42937175995.

It is an arithmetic number, because the mean of its divisors is an integer number (42937175995).

Almost surely, 2^85874351989 is an apocalyptic number.

It is an amenable number.

85874351989 is a deficient number, since it is larger than the sum of its proper divisors (1).

85874351989 is an equidigital number, since it uses as much as digits as its factorization.

85874351989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87091200, while the sum is 67.

The spelling of 85874351989 in words is "eighty-five billion, eight hundred seventy-four million, three hundred fifty-one thousand, nine hundred eighty-nine".