10031981 has 8 divisors (see below), whose sum is σ = 10603200. Its totient is φ = 9465120.

The previous prime is 10031951. The next prime is 10031993. The reversal of 10031981 is 18913001.

10031981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10031981 - 2¹⁰ = 10030957 is a prime.

It is a super-2 number, since 2×10031981² = 201281285568722, 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 (10031911) 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, 4400 + ... + 6278.

It is an arithmetic number, because the mean of its divisors is an integer number (1325400).

Almost surely, 2^10031981 is an apocalyptic number.

It is an amenable number.

10031981 is a deficient number, since it is larger than the sum of its proper divisors (571219).

10031981 is a wasteful number, since it uses less digits than its factorization.

10031981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 10031981 is about 3167.3302638026. The cubic root of 10031981 is about 215.6728945209.

Adding to 10031981 its reverse (18913001), we get a palindrome (28944982).

The spelling of 10031981 in words is "ten million, thirty-one thousand, nine hundred eighty-one".