84591276989 has 4 divisors (see below), whose sum is σ = 84672694080. Its totient is φ = 84509859900.

The previous prime is 84591276971. The next prime is 84591277019. The reversal of 84591276989 is 98967219548.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84591276989 - 2³² = 80296309693 is a prime.

It is a super-2 number, since 2×84591276989² (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 (84591276389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40706987 + ... + 40709064.

It is an arithmetic number, because the mean of its divisors is an integer number (21168173520).

Almost surely, 2^84591276989 is an apocalyptic number.

It is an amenable number.

84591276989 is a deficient number, since it is larger than the sum of its proper divisors (81417091).

84591276989 is a wasteful number, since it uses less digits than its factorization.

84591276989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81417090.

The product of its digits is 78382080, while the sum is 68.

The spelling of 84591276989 in words is "eighty-four billion, five hundred ninety-one million, two hundred seventy-six thousand, nine hundred eighty-nine".