87031396831 has 4 divisors (see below), whose sum is σ = 88673498712. Its totient is φ = 85389294952.

The previous prime is 87031396819. The next prime is 87031396841. The reversal of 87031396831 is 13869313078.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13869313078 = 2 ⋅6934656539.

It is a cyclic number.

It is not a de Polignac number, because 87031396831 - 2¹⁹ = 87030872543 is a prime.

It is a super-2 number, since 2×87031396831² (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 (87031396841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821050861 + ... + 821050966.

It is an arithmetic number, because the mean of its divisors is an integer number (22168374678).

Almost surely, 2^87031396831 is an apocalyptic number.

87031396831 is a deficient number, since it is larger than the sum of its proper divisors (1642101881).

87031396831 is a wasteful number, since it uses less digits than its factorization.

87031396831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642101880.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 87031396831 in words is "eighty-seven billion, thirty-one million, three hundred ninety-six thousand, eight hundred thirty-one".