8418970981 has 2 divisors, whose sum is σ = 8418970982. Its totient is φ = 8418970980.

The previous prime is 8418970943. The next prime is 8418971039. The reversal of 8418970981 is 1890798148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7023948481 + 1395022500 = 83809^2 + 37350^2 .

It is a cyclic number.

It is not a de Polignac number, because 8418970981 - 2¹³ = 8418962789 is a prime.

It is a super-2 number, since 2×8418970981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8418977981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4209485490 + 4209485491.

It is an arithmetic number, because the mean of its divisors is an integer number (4209485491).

Almost surely, 2^8418970981 is an apocalyptic number.

It is an amenable number.

8418970981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8418970981 is an equidigital number, since it uses as much as digits as its factorization.

8418970981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 55.

The square root of 8418970981 is about 91754.9507165690. The cubic root of 8418970981 is about 2034.3218833377.

The spelling of 8418970981 in words is "eight billion, four hundred eighteen million, nine hundred seventy thousand, nine hundred eighty-one".