85511669 has 2 divisors, whose sum is σ = 85511670. Its totient is φ = 85511668.

The previous prime is 85511653. The next prime is 85511681. The reversal of 85511669 is 96611558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83046769 + 2464900 = 9113^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 85511669 - 2⁴ = 85511653 is a prime.

It is a super-2 number, since 2×85511669² = 14624491070331122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85511639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42755834 + 42755835.

It is an arithmetic number, because the mean of its divisors is an integer number (42755835).

Almost surely, 2^85511669 is an apocalyptic number.

It is an amenable number.

85511669 is a deficient number, since it is larger than the sum of its proper divisors (1).

85511669 is an equidigital number, since it uses as much as digits as its factorization.

85511669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The square root of 85511669 is about 9247.2519701801. The cubic root of 85511669 is about 440.5634465531.

The spelling of 85511669 in words is "eighty-five million, five hundred eleven thousand, six hundred sixty-nine".