3640531 has 4 divisors (see below), whose sum is σ = 3644352. Its totient is φ = 3636712.

The previous prime is 3640523. The next prime is 3640537. The reversal of 3640531 is 1350463.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3640531 - 2³ = 3640523 is a prime.

It is a super-2 number, since 2×3640531² = 26506931923922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3640537) 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, 825 + ... + 2821.

It is an arithmetic number, because the mean of its divisors is an integer number (911088).

Almost surely, 2^3640531 is an apocalyptic number.

3640531 is a deficient number, since it is larger than the sum of its proper divisors (3821).

3640531 is a wasteful number, since it uses less digits than its factorization.

3640531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3820.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 3640531 is about 1908.0175575712. The cubic root of 3640531 is about 153.8349133262.

Adding to 3640531 its reverse (1350463), we get a palindrome (4990994).

The spelling of 3640531 in words is "three million, six hundred forty thousand, five hundred thirty-one".