40045121 has 2 divisors, whose sum is σ = 40045122. Its totient is φ = 40045120.

The previous prime is 40045079. The next prime is 40045123. The reversal of 40045121 is 12154004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30924721 + 9120400 = 5561^2 + 3020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40045121 is a prime.

It is a super-2 number, since 2×40045121² = 3207223431809282, which contains 22 as substring.

Together with 40045123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40045121.

It is not a weakly prime, because it can be changed into another prime (40045123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20022560 + 20022561.

It is an arithmetic number, because the mean of its divisors is an integer number (20022561).

Almost surely, 2^40045121 is an apocalyptic number.

It is an amenable number.

40045121 is a deficient number, since it is larger than the sum of its proper divisors (1).

40045121 is an equidigital number, since it uses as much as digits as its factorization.

40045121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 40045121 is about 6328.1214432089. The cubic root of 40045121 is about 342.1237340547.

Adding to 40045121 its reverse (12154004), we get a palindrome (52199125).

The spelling of 40045121 in words is "forty million, forty-five thousand, one hundred twenty-one".