85891649 has 4 divisors (see below), whose sum is σ = 88853460. Its totient is φ = 82929840.

The previous prime is 85891627. The next prime is 85891661. The reversal of 85891649 is 94619858.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64915249 + 20976400 = 8057^2 + 4580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85891649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85891597 and 85891606.

It is not an unprimeable number, because it can be changed into a prime (85891549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1480862 + ... + 1480919.

It is an arithmetic number, because the mean of its divisors is an integer number (22213365).

Almost surely, 2^85891649 is an apocalyptic number.

It is an amenable number.

85891649 is a deficient number, since it is larger than the sum of its proper divisors (2961811).

85891649 is a wasteful number, since it uses less digits than its factorization.

85891649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961810.

The product of its digits is 622080, while the sum is 50.

The square root of 85891649 is about 9267.7747598871. The cubic root of 85891649 is about 441.2150455288.

The spelling of 85891649 in words is "eighty-five million, eight hundred ninety-one thousand, six hundred forty-nine".