85155769 has 2 divisors, whose sum is σ = 85155770. Its totient is φ = 85155768.

The previous prime is 85155743. The next prime is 85155779. The reversal of 85155769 is 96755158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74166544 + 10989225 = 8612^2 + 3315^2 .

It is a cyclic number.

It is not a de Polignac number, because 85155769 - 2⁷ = 85155641 is a prime.

It is a super-2 number, since 2×85155769² = 14503009987962722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85155779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42577884 + 42577885.

It is an arithmetic number, because the mean of its divisors is an integer number (42577885).

Almost surely, 2^85155769 is an apocalyptic number.

It is an amenable number.

85155769 is a deficient number, since it is larger than the sum of its proper divisors (1).

85155769 is an equidigital number, since it uses as much as digits as its factorization.

85155769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 46.

The square root of 85155769 is about 9227.9883506645. The cubic root of 85155769 is about 439.9513875357.

The spelling of 85155769 in words is "eighty-five million, one hundred fifty-five thousand, seven hundred sixty-nine".