3981031 has 4 divisors (see below), whose sum is σ = 3996432. Its totient is φ = 3965632.

The previous prime is 3981017. The next prime is 3981037. The reversal of 3981031 is 1301893.

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

It is a cyclic number.

It is not a de Polignac number, because 3981031 - 2¹⁹ = 3456743 is a prime.

It is a super-2 number, since 2×3981031² = 31697215645922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3980987 and 3981005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7306 + ... + 7831.

It is an arithmetic number, because the mean of its divisors is an integer number (999108).

Almost surely, 2^3981031 is an apocalyptic number.

3981031 is a deficient number, since it is larger than the sum of its proper divisors (15401).

3981031 is a wasteful number, since it uses less digits than its factorization.

3981031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15400.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 3981031 is about 1995.2521143956. The cubic root of 3981031 is about 158.4887790721.

The spelling of 3981031 in words is "three million, nine hundred eighty-one thousand, thirty-one".