40517551 has 2 divisors, whose sum is σ = 40517552. Its totient is φ = 40517550.

The previous prime is 40517549. The next prime is 40517563. The reversal of 40517551 is 15571504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40517551 - 2¹ = 40517549 is a prime.

Together with 40517549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40517501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20258775 + 20258776.

It is an arithmetic number, because the mean of its divisors is an integer number (20258776).

Almost surely, 2^40517551 is an apocalyptic number.

40517551 is a deficient number, since it is larger than the sum of its proper divisors (1).

40517551 is an equidigital number, since it uses as much as digits as its factorization.

40517551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 40517551 is about 6365.3398181087. The cubic root of 40517551 is about 343.4638727121.

It can be divided in two parts, 405 and 17551, that added together give a square (17956 = 134²).

The spelling of 40517551 in words is "forty million, five hundred seventeen thousand, five hundred fifty-one".