40071641 has 2 divisors, whose sum is σ = 40071642. Its totient is φ = 40071640.

The previous prime is 40071599. The next prime is 40071701. The reversal of 40071641 is 14617004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26822041 + 13249600 = 5179^2 + 3640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40071641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40071041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20035820 + 20035821.

It is an arithmetic number, because the mean of its divisors is an integer number (20035821).

Almost surely, 2^40071641 is an apocalyptic number.

It is an amenable number.

40071641 is a deficient number, since it is larger than the sum of its proper divisors (1).

40071641 is an equidigital number, since it uses as much as digits as its factorization.

40071641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 40071641 is about 6330.2165049862. The cubic root of 40071641 is about 342.1992415409.

Adding to 40071641 its reverse (14617004), we get a palindrome (54688645).

The spelling of 40071641 in words is "forty million, seventy-one thousand, six hundred forty-one".