8699981 has 2 divisors, whose sum is σ = 8699982. Its totient is φ = 8699980.

The previous prime is 8699969. The next prime is 8699993. The reversal of 8699981 is 1899968.

It is a balanced prime because it is at equal distance from previous prime (8699969) and next prime (8699993).

It can be written as a sum of positive squares in only one way, i.e., 5244100 + 3455881 = 2290^2 + 1859^2 .

It is a cyclic number.

It is not a de Polignac number, because 8699981 - 2⁶ = 8699917 is a prime.

It is a super-2 number, since 2×8699981² = 151379338800722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8699381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4349990 + 4349991.

It is an arithmetic number, because the mean of its divisors is an integer number (4349991).

Almost surely, 2^8699981 is an apocalyptic number.

It is an amenable number.

8699981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8699981 is an equidigital number, since it uses as much as digits as its factorization.

8699981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 50.

The square root of 8699981 is about 2949.5730199471. The cubic root of 8699981 is about 205.6708618983.

The spelling of 8699981 in words is "eight million, six hundred ninety-nine thousand, nine hundred eighty-one".