85218380431 has 4 divisors (see below), whose sum is σ = 85218998832. Its totient is φ = 85217762032.

The previous prime is 85218380417. The next prime is 85218380473. The reversal of 85218380431 is 13408381258.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 85218380431 - 2²⁷ = 85084162703 is a prime.

It is a super-2 number, since 2×85218380431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85212380431) 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, 1731 + ... + 412843.

It is an arithmetic number, because the mean of its divisors is an integer number (21304749708).

Almost surely, 2^85218380431 is an apocalyptic number.

85218380431 is a deficient number, since it is larger than the sum of its proper divisors (618401).

85218380431 is a wasteful number, since it uses less digits than its factorization.

85218380431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618400.

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 85218380431 in words is "eighty-five billion, two hundred eighteen million, three hundred eighty thousand, four hundred thirty-one".