40531609 has 2 divisors, whose sum is σ = 40531610. Its totient is φ = 40531608.

The previous prime is 40531607. The next prime is 40531619. The reversal of 40531609 is 90613504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37027225 + 3504384 = 6085^2 + 1872^2 .

It is a cyclic number.

It is not a de Polignac number, because 40531609 - 2¹ = 40531607 is a prime.

It is a super-2 number, since 2×40531609² = 3285622656257762, which contains 22 as substring.

Together with 40531607, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40531607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20265804 + 20265805.

It is an arithmetic number, because the mean of its divisors is an integer number (20265805).

Almost surely, 2^40531609 is an apocalyptic number.

It is an amenable number.

40531609 is a deficient number, since it is larger than the sum of its proper divisors (1).

40531609 is an equidigital number, since it uses as much as digits as its factorization.

40531609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 40531609 is about 6366.4439838893. The cubic root of 40531609 is about 343.5035909469.

The spelling of 40531609 in words is "forty million, five hundred thirty-one thousand, six hundred nine".