63540709 has 2 divisors, whose sum is σ = 63540710. Its totient is φ = 63540708.

The previous prime is 63540707. The next prime is 63540739. The reversal of 63540709 is 90704536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55577025 + 7963684 = 7455^2 + 2822^2 .

It is a cyclic number.

It is not a de Polignac number, because 63540709 - 2¹ = 63540707 is a prime.

Together with 63540707, 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 (63540703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31770354 + 31770355.

It is an arithmetic number, because the mean of its divisors is an integer number (31770355).

Almost surely, 2^63540709 is an apocalyptic number.

It is an amenable number.

63540709 is a deficient number, since it is larger than the sum of its proper divisors (1).

63540709 is an equidigital number, since it uses as much as digits as its factorization.

63540709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 63540709 is about 7971.2426258395. The cubic root of 63540709 is about 399.0408456456.

The spelling of 63540709 in words is "sixty-three million, five hundred forty thousand, seven hundred nine".