4009531 has 2 divisors, whose sum is σ = 4009532. Its totient is φ = 4009530.

The previous prime is 4009529. The next prime is 4009543. The reversal of 4009531 is 1359004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4009531 - 2¹ = 4009529 is a prime.

It is a super-2 number, since 2×4009531² = 32152677679922, which contains 22 as substring.

Together with 4009529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4009631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2004765 + 2004766.

It is an arithmetic number, because the mean of its divisors is an integer number (2004766).

Almost surely, 2^4009531 is an apocalyptic number.

4009531 is a deficient number, since it is larger than the sum of its proper divisors (1).

4009531 is an equidigital number, since it uses as much as digits as its factorization.

4009531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 4009531 is about 2002.3813323141. The cubic root of 4009531 is about 158.8660845192.

The spelling of 4009531 in words is "four million, nine thousand, five hundred thirty-one".