85387388731 has 4 divisors (see below), whose sum is σ = 87695156032. Its totient is φ = 83079621432.

The previous prime is 85387388693. The next prime is 85387388747. The reversal of 85387388731 is 13788378358.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13788378358 = 2 ⋅6894189179.

It is a cyclic number.

It is not a de Polignac number, because 85387388731 - 2¹¹ = 85387386683 is a prime.

It is a super-2 number, since 2×85387388731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85387388731.

It is not an unprimeable number, because it can be changed into a prime (85387488731) 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, 1153883595 + ... + 1153883668.

It is an arithmetic number, because the mean of its divisors is an integer number (21923789008).

Almost surely, 2^85387388731 is an apocalyptic number.

85387388731 is a deficient number, since it is larger than the sum of its proper divisors (2307767301).

85387388731 is a wasteful number, since it uses less digits than its factorization.

85387388731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307767300.

The product of its digits is 27095040, while the sum is 61.

The spelling of 85387388731 in words is "eighty-five billion, three hundred eighty-seven million, three hundred eighty-eight thousand, seven hundred thirty-one".