63749909 has 2 divisors, whose sum is σ = 63749910. Its totient is φ = 63749908.

The previous prime is 63749869. The next prime is 63749911. The reversal of 63749909 is 90994736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47306884 + 16443025 = 6878^2 + 4055^2 .

It is a cyclic number.

It is not a de Polignac number, because 63749909 - 2¹² = 63745813 is a prime.

It is a Sophie Germain prime.

Together with 63749911, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63749929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31874954 + 31874955.

It is an arithmetic number, because the mean of its divisors is an integer number (31874955).

Almost surely, 2^63749909 is an apocalyptic number.

It is an amenable number.

63749909 is a deficient number, since it is larger than the sum of its proper divisors (1).

63749909 is an equidigital number, since it uses as much as digits as its factorization.

63749909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 63749909 is about 7984.3540126926. The cubic root of 63749909 is about 399.4782969440.

The spelling of 63749909 in words is "sixty-three million, seven hundred forty-nine thousand, nine hundred nine".