87031708781 has 2 divisors, whose sum is σ = 87031708782. Its totient is φ = 87031708780.

The previous prime is 87031708727. The next prime is 87031708837. The reversal of 87031708781 is 18780713078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84875499556 + 2156209225 = 291334^2 + 46435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87031708781 is a prime.

It is a super-2 number, since 2×87031708781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87031708081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43515854390 + 43515854391.

It is an arithmetic number, because the mean of its divisors is an integer number (43515854391).

Almost surely, 2^87031708781 is an apocalyptic number.

It is an amenable number.

87031708781 is a deficient number, since it is larger than the sum of its proper divisors (1).

87031708781 is an equidigital number, since it uses as much as digits as its factorization.

87031708781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 526848, while the sum is 50.

The spelling of 87031708781 in words is "eighty-seven billion, thirty-one million, seven hundred eight thousand, seven hundred eighty-one".