85389491 has 4 divisors (see below), whose sum is σ = 93152184. Its totient is φ = 77626800.

The previous prime is 85389463. The next prime is 85389509. The reversal of 85389491 is 19498358.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85389491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85389431) 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, 3881330 + ... + 3881351.

It is an arithmetic number, because the mean of its divisors is an integer number (23288046).

Almost surely, 2^85389491 is an apocalyptic number.

85389491 is a deficient number, since it is larger than the sum of its proper divisors (7762693).

85389491 is a wasteful number, since it uses less digits than its factorization.

85389491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7762692.

The product of its digits is 311040, while the sum is 47.

The square root of 85389491 is about 9240.6434299782. The cubic root of 85389491 is about 440.3535227005.

The spelling of 85389491 in words is "eighty-five million, three hundred eighty-nine thousand, four hundred ninety-one".