86942404781 has 2 divisors, whose sum is σ = 86942404782. Its totient is φ = 86942404780.

The previous prime is 86942404763. The next prime is 86942404837. The reversal of 86942404781 is 18740424968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52230988681 + 34711416100 = 228541^2 + 186310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86942404781 is a prime.

It is a super-2 number, since 2×86942404781² (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 (86942404711) 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 as a sum of consecutive naturals, namely, 43471202390 + 43471202391.

It is an arithmetic number, because the mean of its divisors is an integer number (43471202391).

Almost surely, 2^86942404781 is an apocalyptic number.

It is an amenable number.

86942404781 is a deficient number, since it is larger than the sum of its proper divisors (1).

86942404781 is an equidigital number, since it uses as much as digits as its factorization.

86942404781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3096576, while the sum is 53.

The spelling of 86942404781 in words is "eighty-six billion, nine hundred forty-two million, four hundred four thousand, seven hundred eighty-one".