84105431 has 4 divisors (see below), whose sum is σ = 84159000. Its totient is φ = 84051864.

The previous prime is 84105421. The next prime is 84105479. The reversal of 84105431 is 13450148.

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 84105431 - 2⁶ = 84105367 is a prime.

It is a super-3 number, since 3×84105431³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 84105431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84105401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24356 + ... + 27593.

It is an arithmetic number, because the mean of its divisors is an integer number (21039750).

Almost surely, 2^84105431 is an apocalyptic number.

84105431 is a deficient number, since it is larger than the sum of its proper divisors (53569).

84105431 is a wasteful number, since it uses less digits than its factorization.

84105431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53568.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 84105431 is about 9170.9013188454. The cubic root of 84105431 is about 438.1350663844.

Adding to 84105431 its reverse (13450148), we get a palindrome (97555579).

The spelling of 84105431 in words is "eighty-four million, one hundred five thousand, four hundred thirty-one".