3891031 has 8 divisors (see below), whose sum is σ = 4038944. Its totient is φ = 3745440.

The previous prime is 3890981. The next prime is 3891037. The reversal of 3891031 is 1301983.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3891031 is a prime.

It is a super-2 number, since 2×3891031² = 30280244485922, which contains 22 as substring.

It is a Duffinian number.

3891031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3890987 and 3891005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891037) 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, 3301 + ... + 4321.

It is an arithmetic number, because the mean of its divisors is an integer number (504868).

Almost surely, 2^3891031 is an apocalyptic number.

3891031 is a deficient number, since it is larger than the sum of its proper divisors (147913).

3891031 is a wasteful number, since it uses less digits than its factorization.

3891031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161.

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

The square root of 3891031 is about 1972.5696438909. The cubic root of 3891031 is about 157.2853344955.

The spelling of 3891031 in words is "three million, eight hundred ninety-one thousand, thirty-one".