8501981 has 4 divisors (see below), whose sum is σ = 8531292. Its totient is φ = 8472672.

The previous prime is 8501951. The next prime is 8501993. The reversal of 8501981 is 1891058.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5134756 + 3367225 = 2266^2 + 1835^2 .

It is a cyclic number.

It is not a de Polignac number, because 8501981 - 2¹⁰ = 8500957 is a prime.

It is a super-2 number, since 2×8501981² = 144567361848722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8501951) 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 in 3 ways as a sum of consecutive naturals, for example, 14216 + ... + 14801.

It is an arithmetic number, because the mean of its divisors is an integer number (2132823).

Almost surely, 2^8501981 is an apocalyptic number.

It is an amenable number.

8501981 is a deficient number, since it is larger than the sum of its proper divisors (29311).

8501981 is a wasteful number, since it uses less digits than its factorization.

8501981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29310.

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

The square root of 8501981 is about 2915.8156663273. The cubic root of 8501981 is about 204.0986082933.

The spelling of 8501981 in words is "eight million, five hundred one thousand, nine hundred eighty-one".