87031396819 has 2 divisors, whose sum is σ = 87031396820. Its totient is φ = 87031396818.

The previous prime is 87031396783. The next prime is 87031396841. The reversal of 87031396819 is 91869313078.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87031396819 - 2¹⁷ = 87031265747 is a prime.

It is a super-2 number, since 2×87031396819² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87031396819.

It is not a weakly prime, because it can be changed into another prime (87031396919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43515698409 + 43515698410.

It is an arithmetic number, because the mean of its divisors is an integer number (43515698410).

Almost surely, 2^87031396819 is an apocalyptic number.

87031396819 is a deficient number, since it is larger than the sum of its proper divisors (1).

87031396819 is an equidigital number, since it uses as much as digits as its factorization.

87031396819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 87031396819 in words is "eighty-seven billion, thirty-one million, three hundred ninety-six thousand, eight hundred nineteen".