85669591 has 6 divisors (see below), whose sum is σ = 99656520. Its totient is φ = 73431036.

The previous prime is 85669589. The next prime is 85669601. The reversal of 85669591 is 19596658.

It is not a de Polignac number, because 85669591 - 2¹ = 85669589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 1748359 = 85669591 / (8 + 5 + 6 + 6 + 9 + 5 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85669691) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 874131 + ... + 874228.

It is an arithmetic number, because the mean of its divisors is an integer number (16609420).

Almost surely, 2^85669591 is an apocalyptic number.

85669591 is a deficient number, since it is larger than the sum of its proper divisors (13986929).

85669591 is a wasteful number, since it uses less digits than its factorization.

85669591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748373 (or 1748366 counting only the distinct ones).

The product of its digits is 583200, while the sum is 49.

The square root of 85669591 is about 9255.7868925338. The cubic root of 85669591 is about 440.8344889945.

The spelling of 85669591 in words is "eighty-five million, six hundred sixty-nine thousand, five hundred ninety-one".