63181009 has 2 divisors, whose sum is σ = 63181010. Its totient is φ = 63181008.

The previous prime is 63181003. The next prime is 63181021. The reversal of 63181009 is 90018136.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42614784 + 20566225 = 6528^2 + 4535^2 .

It is a cyclic number.

It is not a de Polignac number, because 63181009 - 2¹⁹ = 62656721 is a prime.

It is not a weakly prime, because it can be changed into another prime (63181003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31590504 + 31590505.

It is an arithmetic number, because the mean of its divisors is an integer number (31590505).

Almost surely, 2^63181009 is an apocalyptic number.

It is an amenable number.

63181009 is a deficient number, since it is larger than the sum of its proper divisors (1).

63181009 is an equidigital number, since it uses as much as digits as its factorization.

63181009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 63181009 is about 7948.6482498598. The cubic root of 63181009 is about 398.2864384998.

The spelling of 63181009 in words is "sixty-three million, one hundred eighty-one thousand, nine".