3943531 has 2 divisors, whose sum is σ = 3943532. Its totient is φ = 3943530.

The previous prime is 3943529. The next prime is 3943543. The reversal of 3943531 is 1353493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3943531 - 2¹ = 3943529 is a prime.

It is a super-2 number, since 2×3943531² = 31102873495922, which contains 22 as substring.

Together with 3943529, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 3943531.

It is not a weakly prime, because it can be changed into another prime (3943591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1971765 + 1971766.

It is an arithmetic number, because the mean of its divisors is an integer number (1971766).

Almost surely, 2^3943531 is an apocalyptic number.

3943531 is a deficient number, since it is larger than the sum of its proper divisors (1).

3943531 is an equidigital number, since it uses as much as digits as its factorization.

3943531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 28.

The square root of 3943531 is about 1985.8325709888. The cubic root of 3943531 is about 157.9895709615.

The spelling of 3943531 in words is "three million, nine hundred forty-three thousand, five hundred thirty-one".