3997531 has 4 divisors (see below), whose sum is σ = 4004392. Its totient is φ = 3990672.

The previous prime is 3997507. The next prime is 3997547. The reversal of 3997531 is 1357993.

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 3997531 - 2⁷ = 3997403 is a prime.

It is a super-2 number, since 2×3997531² = 31960508191922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3992531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2466 + ... + 3751.

It is an arithmetic number, because the mean of its divisors is an integer number (1001098).

Almost surely, 2^3997531 is an apocalyptic number.

3997531 is a deficient number, since it is larger than the sum of its proper divisors (6861).

3997531 is an equidigital number, since it uses as much as digits as its factorization.

3997531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6860.

The product of its digits is 25515, while the sum is 37.

The square root of 3997531 is about 1999.3826547212. The cubic root of 3997531 is about 158.7074376979.

The spelling of 3997531 in words is "three million, nine hundred ninety-seven thousand, five hundred thirty-one".