85831387 has 4 divisors (see below), whose sum is σ = 88791120. Its totient is φ = 82871656.

The previous prime is 85831381. The next prime is 85831393. The reversal of 85831387 is 78313858.

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

It is an interprime number because it is at equal distance from previous prime (85831381) and next prime (85831393).

It is a cyclic number.

It is not a de Polignac number, because 85831387 - 2¹⁹ = 85307099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85831381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1479823 + ... + 1479880.

It is an arithmetic number, because the mean of its divisors is an integer number (22197780).

Almost surely, 2^85831387 is an apocalyptic number.

85831387 is a deficient number, since it is larger than the sum of its proper divisors (2959733).

85831387 is a wasteful number, since it uses less digits than its factorization.

85831387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2959732.

The product of its digits is 161280, while the sum is 43.

The square root of 85831387 is about 9264.5230314356. The cubic root of 85831387 is about 441.1118351779. Note that the first 3 decimals are identical.

The spelling of 85831387 in words is "eighty-five million, eight hundred thirty-one thousand, three hundred eighty-seven".