85387305831 has 4 divisors (see below), whose sum is σ = 113849741112. Its totient is φ = 56924870552.

The previous prime is 85387305797. The next prime is 85387305877. The reversal of 85387305831 is 13850378358.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 85387305831 - 2²¹ = 85385208679 is a prime.

It is a super-2 number, since 2×85387305831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85387305431) 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, 14231217636 + ... + 14231217641.

It is an arithmetic number, because the mean of its divisors is an integer number (28462435278).

Almost surely, 2^85387305831 is an apocalyptic number.

85387305831 is a deficient number, since it is larger than the sum of its proper divisors (28462435281).

85387305831 is a wasteful number, since it uses less digits than its factorization.

85387305831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28462435280.

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 85387305831 in words is "eighty-five billion, three hundred eighty-seven million, three hundred five thousand, eight hundred thirty-one".