40717121 has 2 divisors, whose sum is σ = 40717122. Its totient is φ = 40717120.

The previous prime is 40717111. The next prime is 40717123. The reversal of 40717121 is 12171704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 16313521 = 4940^2 + 4039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40717121 is a prime.

Together with 40717123, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2474600 and since 40717121 and 2474600 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40717123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20358560 + 20358561.

It is an arithmetic number, because the mean of its divisors is an integer number (20358561).

Almost surely, 2^40717121 is an apocalyptic number.

It is an amenable number.

40717121 is a deficient number, since it is larger than the sum of its proper divisors (1).

40717121 is an equidigital number, since it uses as much as digits as its factorization.

40717121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 40717121 is about 6380.9968656943. The cubic root of 40717121 is about 344.0268620857.

Adding to 40717121 its reverse (12171704), we get a palindrome (52888825).

The spelling of 40717121 in words is "forty million, seven hundred seventeen thousand, one hundred twenty-one".