3921031 has 4 divisors (see below), whose sum is σ = 3961552. Its totient is φ = 3880512.

The previous prime is 3921023. The next prime is 3921037. The reversal of 3921031 is 1301293.

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 3921031 - 2³ = 3921023 is a prime.

It is a super-2 number, since 2×3921031² = 30748968205922, which contains 22 as substring.

It is a Duffinian number.

3921031 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921037) 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, 20115 + ... + 20308.

It is an arithmetic number, because the mean of its divisors is an integer number (990388).

Almost surely, 2^3921031 is an apocalyptic number.

3921031 is a deficient number, since it is larger than the sum of its proper divisors (40521).

3921031 is an equidigital number, since it uses as much as digits as its factorization.

3921031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40520.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 3921031 is about 1980.1593370232. The cubic root of 3921031 is about 157.6885254023.

The spelling of 3921031 in words is "three million, nine hundred twenty-one thousand, thirty-one".