86838791621 has 4 divisors (see below), whose sum is σ = 91946955852. Its totient is φ = 81730627392.

The previous prime is 86838791603. The next prime is 86838791629. The reversal of 86838791621 is 12619783868.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78271252900 + 8567538721 = 279770^2 + 92561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86838791621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86838791629) 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, 2554082090 + ... + 2554082123.

It is an arithmetic number, because the mean of its divisors is an integer number (22986738963).

Almost surely, 2^86838791621 is an apocalyptic number.

It is an amenable number.

86838791621 is a deficient number, since it is larger than the sum of its proper divisors (5108164231).

86838791621 is a wasteful number, since it uses less digits than its factorization.

86838791621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108164230.

The product of its digits is 6967296, while the sum is 59.

The spelling of 86838791621 in words is "eighty-six billion, eight hundred thirty-eight million, seven hundred ninety-one thousand, six hundred twenty-one".