8015981 has 2 divisors, whose sum is σ = 8015982. Its totient is φ = 8015980.

The previous prime is 8015957. The next prime is 8015989. The reversal of 8015981 is 1895108.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5597956 + 2418025 = 2366^2 + 1555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8015981 is a prime.

It is a super-2 number, since 2×8015981² = 128511902784722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8015989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4007990 + 4007991.

It is an arithmetic number, because the mean of its divisors is an integer number (4007991).

Almost surely, 2^8015981 is an apocalyptic number.

It is an amenable number.

8015981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8015981 is an equidigital number, since it uses as much as digits as its factorization.

8015981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 8015981 is about 2831.2507836644. The cubic root of 8015981 is about 200.1330864204.

It can be divided in two parts, 80 and 15981, that added together give a palindrome (16061).

The spelling of 8015981 in words is "eight million, fifteen thousand, nine hundred eighty-one".