8140981 has 2 divisors, whose sum is σ = 8140982. Its totient is φ = 8140980.

The previous prime is 8140963. The next prime is 8140991. The reversal of 8140981 is 1890418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6275025 + 1865956 = 2505^2 + 1366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8140981 is a prime.

It is a super-2 number, since 2×8140981² = 132551143284722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8140961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4070490 + 4070491.

It is an arithmetic number, because the mean of its divisors is an integer number (4070491).

Almost surely, 2^8140981 is an apocalyptic number.

It is an amenable number.

8140981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8140981 is an equidigital number, since it uses as much as digits as its factorization.

8140981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 8140981 is about 2853.2404385190. The cubic root of 8140981 is about 201.1680071841.

The spelling of 8140981 in words is "eight million, one hundred forty thousand, nine hundred eighty-one".