87819442831 has 4 divisors (see below), whose sum is σ = 89056336464. Its totient is φ = 86582549200.

The previous prime is 87819442829. The next prime is 87819442853. The reversal of 87819442831 is 13824491878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13824491878 = 2 ⋅6912245939.

It is a cyclic number.

It is not a de Polignac number, because 87819442831 - 2¹ = 87819442829 is a prime.

It is a super-2 number, since 2×87819442831² (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 (87819442861) 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, 618446710 + ... + 618446851.

It is an arithmetic number, because the mean of its divisors is an integer number (22264084116).

Almost surely, 2^87819442831 is an apocalyptic number.

87819442831 is a deficient number, since it is larger than the sum of its proper divisors (1236893633).

87819442831 is a wasteful number, since it uses less digits than its factorization.

87819442831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236893632.

The product of its digits is 3096576, while the sum is 55.

The spelling of 87819442831 in words is "eighty-seven billion, eight hundred nineteen million, four hundred forty-two thousand, eight hundred thirty-one".