40121261 has 2 divisors, whose sum is σ = 40121262. Its totient is φ = 40121260.

The previous prime is 40121251. The next prime is 40121303. The reversal of 40121261 is 16212104.

40121261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38365636 + 1755625 = 6194^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 40121261 - 2⁶ = 40121197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060630 + 20060631.

It is an arithmetic number, because the mean of its divisors is an integer number (20060631).

Almost surely, 2^40121261 is an apocalyptic number.

It is an amenable number.

40121261 is a deficient number, since it is larger than the sum of its proper divisors (1).

40121261 is an equidigital number, since it uses as much as digits as its factorization.

40121261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 40121261 is about 6334.1345896657. The cubic root of 40121261 is about 342.3404296905.

Adding to 40121261 its reverse (16212104), we get a palindrome (56333365).

The spelling of 40121261 in words is "forty million, one hundred twenty-one thousand, two hundred sixty-one".