40513661 has 2 divisors, whose sum is σ = 40513662. Its totient is φ = 40513660.

The previous prime is 40513657. The next prime is 40513663. The reversal of 40513661 is 16631504.

40513661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33570436 + 6943225 = 5794^2 + 2635^2 .

It is a cyclic number.

It is not a de Polignac number, because 40513661 - 2² = 40513657 is a prime.

Together with 40513663, 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 40513661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40513663) 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, 20256830 + 20256831.

It is an arithmetic number, because the mean of its divisors is an integer number (20256831).

Almost surely, 2^40513661 is an apocalyptic number.

It is an amenable number.

40513661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40513661 is an equidigital number, since it uses as much as digits as its factorization.

40513661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 40513661 is about 6365.0342497115. The cubic root of 40513661 is about 343.4528806261.

The spelling of 40513661 in words is "forty million, five hundred thirteen thousand, six hundred sixty-one".