85511421431 has 4 divisors (see below), whose sum is σ = 85512091200. Its totient is φ = 85510751664.

The previous prime is 85511421427. The next prime is 85511421439. The reversal of 85511421431 is 13412411558.

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 85511421431 - 2² = 85511421427 is a prime.

It is a super-2 number, since 2×85511421431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85511421391 and 85511421400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85511421439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77366 + ... + 420723.

It is an arithmetic number, because the mean of its divisors is an integer number (21378022800).

Almost surely, 2^85511421431 is an apocalyptic number.

85511421431 is a deficient number, since it is larger than the sum of its proper divisors (669769).

85511421431 is a wasteful number, since it uses less digits than its factorization.

85511421431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669768.

The product of its digits is 19200, while the sum is 35.

Adding to 85511421431 its reverse (13412411558), we get a palindrome (98923832989).

The spelling of 85511421431 in words is "eighty-five billion, five hundred eleven million, four hundred twenty-one thousand, four hundred thirty-one".