40521161 has 4 divisors (see below), whose sum is σ = 41509524. Its totient is φ = 39532800.

The previous prime is 40521157. The next prime is 40521163. The reversal of 40521161 is 16112504.

40521161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11155600 + 29365561 = 3340^2 + 5419^2 .

It is a cyclic number.

It is not a de Polignac number, because 40521161 - 2² = 40521157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40521163) 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 in 3 ways as a sum of consecutive naturals, for example, 494120 + ... + 494201.

It is an arithmetic number, because the mean of its divisors is an integer number (10377381).

Almost surely, 2^40521161 is an apocalyptic number.

40521161 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40521161 is a deficient number, since it is larger than the sum of its proper divisors (988363).

40521161 is an equidigital number, since it uses as much as digits as its factorization.

40521161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988362.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 40521161 is about 6365.6233787430. The cubic root of 40521161 is about 343.4740729647.

Adding to 40521161 its reverse (16112504), we get a palindrome (56633665).

The spelling of 40521161 in words is "forty million, five hundred twenty-one thousand, one hundred sixty-one".