86966981 has 2 divisors, whose sum is σ = 86966982. Its totient is φ = 86966980.

The previous prime is 86966963. The next prime is 86967031. The reversal of 86966981 is 18966968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76300225 + 10666756 = 8735^2 + 3266^2 .

It is a cyclic number.

It is not a de Polignac number, because 86966981 - 2¹⁸ = 86704837 is a prime.

It is a super-2 number, since 2×86966981² = 15126511568508722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86965981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43483490 + 43483491.

It is an arithmetic number, because the mean of its divisors is an integer number (43483491).

Almost surely, 2^86966981 is an apocalyptic number.

It is an amenable number.

86966981 is a deficient number, since it is larger than the sum of its proper divisors (1).

86966981 is an equidigital number, since it uses as much as digits as its factorization.

86966981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 53.

The square root of 86966981 is about 9325.6088809257. The cubic root of 86966981 is about 443.0486980794.

The spelling of 86966981 in words is "eighty-six million, nine hundred sixty-six thousand, nine hundred eighty-one".