85870789349 has 2 divisors, whose sum is σ = 85870789350. Its totient is φ = 85870789348.

The previous prime is 85870789297. The next prime is 85870789373. The reversal of 85870789349 is 94398707858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83988097249 + 1882692100 = 289807^2 + 43390^2 .

It is a cyclic number.

It is not a de Polignac number, because 85870789349 - 2⁸ = 85870789093 is a prime.

It is a super-3 number, since 3×85870789349³ (a number of 34 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85870789649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42935394674 + 42935394675.

It is an arithmetic number, because the mean of its divisors is an integer number (42935394675).

Almost surely, 2^85870789349 is an apocalyptic number.

It is an amenable number.

85870789349 is a deficient number, since it is larger than the sum of its proper divisors (1).

85870789349 is an equidigital number, since it uses as much as digits as its factorization.

85870789349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 121927680, while the sum is 68.

The spelling of 85870789349 in words is "eighty-five billion, eight hundred seventy million, seven hundred eighty-nine thousand, three hundred forty-nine".