63642281 has 2 divisors, whose sum is σ = 63642282. Its totient is φ = 63642280.

The previous prime is 63642259. The next prime is 63642283. The reversal of 63642281 is 18224636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50537881 + 13104400 = 7109^2 + 3620^2 .

It is a cyclic number.

It is not a de Polignac number, because 63642281 - 2⁶ = 63642217 is a prime.

It is a super-2 number, since 2×63642281² = 8100679861765922, which contains 22 as substring.

Together with 63642283, 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 (63642283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31821140 + 31821141.

It is an arithmetic number, because the mean of its divisors is an integer number (31821141).

Almost surely, 2^63642281 is an apocalyptic number.

It is an amenable number.

63642281 is a deficient number, since it is larger than the sum of its proper divisors (1).

63642281 is an equidigital number, since it uses as much as digits as its factorization.

63642281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 32.

The square root of 63642281 is about 7977.6112339472. The cubic root of 63642281 is about 399.2533592695.

The spelling of 63642281 in words is "sixty-three million, six hundred forty-two thousand, two hundred eighty-one".