40631609 has 2 divisors, whose sum is σ = 40631610. Its totient is φ = 40631608.

The previous prime is 40631599. The next prime is 40631623. The reversal of 40631609 is 90613604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26214400 + 14417209 = 5120^2 + 3797^2 .

It is a cyclic number.

It is not a de Polignac number, because 40631609 - 2²⁴ = 23854393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40631909) 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 as a sum of consecutive naturals, namely, 20315804 + 20315805.

It is an arithmetic number, because the mean of its divisors is an integer number (20315805).

Almost surely, 2^40631609 is an apocalyptic number.

It is an amenable number.

40631609 is a deficient number, since it is larger than the sum of its proper divisors (1).

40631609 is an equidigital number, since it uses as much as digits as its factorization.

40631609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 40631609 is about 6374.2928235217. The cubic root of 40631609 is about 343.7858574606.

The spelling of 40631609 in words is "forty million, six hundred thirty-one thousand, six hundred nine".