40555513 has 2 divisors, whose sum is σ = 40555514. Its totient is φ = 40555512.

The previous prime is 40555511. The next prime is 40555517. The reversal of 40555513 is 31555504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21650409 + 18905104 = 4653^2 + 4348^2 .

It is a cyclic number.

It is not a de Polignac number, because 40555513 - 2¹ = 40555511 is a prime.

Together with 40555511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40555511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20277756 + 20277757.

It is an arithmetic number, because the mean of its divisors is an integer number (20277757).

Almost surely, 2^40555513 is an apocalyptic number.

It is an amenable number.

40555513 is a deficient number, since it is larger than the sum of its proper divisors (1).

40555513 is an equidigital number, since it uses as much as digits as its factorization.

40555513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 40555513 is about 6368.3210503240. The cubic root of 40555513 is about 343.5711061231.

Subtracting from 40555513 its reverse (31555504), we obtain a palindrome (9000009).

The spelling of 40555513 in words is "forty million, five hundred fifty-five thousand, five hundred thirteen".