40509641 has 2 divisors, whose sum is σ = 40509642. Its totient is φ = 40509640.

The previous prime is 40509593. The next prime is 40509659. The reversal of 40509641 is 14690504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33640000 + 6869641 = 5800^2 + 2621^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40509641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40509661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20254820 + 20254821.

It is an arithmetic number, because the mean of its divisors is an integer number (20254821).

Almost surely, 2^40509641 is an apocalyptic number.

It is an amenable number.

40509641 is a deficient number, since it is larger than the sum of its proper divisors (1).

40509641 is an equidigital number, since it uses as much as digits as its factorization.

40509641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 40509641 is about 6364.7184541031. The cubic root of 40509641 is about 343.4415204559.

The spelling of 40509641 in words is "forty million, five hundred nine thousand, six hundred forty-one".