63911213 has 2 divisors, whose sum is σ = 63911214. Its totient is φ = 63911212.

The previous prime is 63911209. The next prime is 63911249. The reversal of 63911213 is 31211936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58951684 + 4959529 = 7678^2 + 2227^2 .

It is a cyclic number.

It is not a de Polignac number, because 63911213 - 2² = 63911209 is a prime.

It is a Sophie Germain 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 (63901213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31955606 + 31955607.

It is an arithmetic number, because the mean of its divisors is an integer number (31955607).

Almost surely, 2^63911213 is an apocalyptic number.

It is an amenable number.

63911213 is a deficient number, since it is larger than the sum of its proper divisors (1).

63911213 is an equidigital number, since it uses as much as digits as its factorization.

63911213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 26.

The square root of 63911213 is about 7994.4488865712. The cubic root of 63911213 is about 399.8149414799.

The spelling of 63911213 in words is "sixty-three million, nine hundred eleven thousand, two hundred thirteen".