63540409 has 2 divisors, whose sum is σ = 63540410. Its totient is φ = 63540408.

The previous prime is 63540403. The next prime is 63540443. The reversal of 63540409 is 90404536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31866025 + 31674384 = 5645^2 + 5628^2 .

It is a cyclic number.

It is not a de Polignac number, because 63540409 - 2²³ = 55151801 is a prime.

It is not a weakly prime, because it can be changed into another prime (63540403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31770204 + 31770205.

It is an arithmetic number, because the mean of its divisors is an integer number (31770205).

Almost surely, 2^63540409 is an apocalyptic number.

It is an amenable number.

63540409 is a deficient number, since it is larger than the sum of its proper divisors (1).

63540409 is an equidigital number, since it uses as much as digits as its factorization.

63540409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 63540409 is about 7971.2238081740. The cubic root of 63540409 is about 399.0402176365.

The spelling of 63540409 in words is "sixty-three million, five hundred forty thousand, four hundred nine".