8031981 has 8 divisors (see below), whose sum is σ = 10723104. Its totient is φ = 5347760.

The previous prime is 8031979. The next prime is 8032001. The reversal of 8031981 is 1891308.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8031981 - 2¹ = 8031979 is a prime.

It is a super-2 number, since 2×8031981² = 129025437568722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8031911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2410 + ... + 4676.

It is an arithmetic number, because the mean of its divisors is an integer number (1340388).

Almost surely, 2^8031981 is an apocalyptic number.

It is an amenable number.

8031981 is a deficient number, since it is larger than the sum of its proper divisors (2691123).

8031981 is a wasteful number, since it uses less digits than its factorization.

8031981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3451.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 8031981 is about 2834.0749813652. The cubic root of 8031981 is about 200.2661539865.

The spelling of 8031981 in words is "eight million, thirty-one thousand, nine hundred eighty-one".