63977909 has 2 divisors, whose sum is σ = 63977910. Its totient is φ = 63977908.

The previous prime is 63977873. The next prime is 63977929. The reversal of 63977909 is 90977936.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61575409 + 2402500 = 7847^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 63977909 - 2¹² = 63973813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63977929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31988954 + 31988955.

It is an arithmetic number, because the mean of its divisors is an integer number (31988955).

Almost surely, 2^63977909 is an apocalyptic number.

It is an amenable number.

63977909 is a deficient number, since it is larger than the sum of its proper divisors (1).

63977909 is an equidigital number, since it uses as much as digits as its factorization.

63977909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 642978, while the sum is 50.

The square root of 63977909 is about 7998.6191933358. The cubic root of 63977909 is about 399.9539717870.

The spelling of 63977909 in words is "sixty-three million, nine hundred seventy-seven thousand, nine hundred nine".