63943961 has 2 divisors, whose sum is σ = 63943962. Its totient is φ = 63943960.

The previous prime is 63943951. The next prime is 63943963. The reversal of 63943961 is 16934936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38502025 + 25441936 = 6205^2 + 5044^2 .

It is a cyclic number.

It is not a de Polignac number, because 63943961 - 2¹⁰ = 63942937 is a prime.

Together with 63943963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63943963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31971980 + 31971981.

It is an arithmetic number, because the mean of its divisors is an integer number (31971981).

Almost surely, 2^63943961 is an apocalyptic number.

It is an amenable number.

63943961 is a deficient number, since it is larger than the sum of its proper divisors (1).

63943961 is an equidigital number, since it uses as much as digits as its factorization.

63943961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 41.

The square root of 63943961 is about 7996.4967954724. The cubic root of 63943961 is about 399.8832179916.

The spelling of 63943961 in words is "sixty-three million, nine hundred forty-three thousand, nine hundred sixty-one".