63391609 has 2 divisors, whose sum is σ = 63391610. Its totient is φ = 63391608.

The previous prime is 63391583. The next prime is 63391637. The reversal of 63391609 is 90619336.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50410000 + 12981609 = 7100^2 + 3603^2 .

It is a cyclic number.

It is not a de Polignac number, because 63391609 - 2⁷ = 63391481 is a prime.

It is not a weakly prime, because it can be changed into another prime (63391639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31695804 + 31695805.

It is an arithmetic number, because the mean of its divisors is an integer number (31695805).

Almost surely, 2^63391609 is an apocalyptic number.

It is an amenable number.

63391609 is a deficient number, since it is larger than the sum of its proper divisors (1).

63391609 is an equidigital number, since it uses as much as digits as its factorization.

63391609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 63391609 is about 7961.8847643005. The cubic root of 63391609 is about 398.7284811322.

It can be divided in two parts, 63391 and 609, that added together give a cube (64000 = 40³).

The spelling of 63391609 in words is "sixty-three million, three hundred ninety-one thousand, six hundred nine".