63861841 has 2 divisors, whose sum is σ = 63861842. Its totient is φ = 63861840.

The previous prime is 63861839. The next prime is 63861859. The reversal of 63861841 is 14816836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58844241 + 5017600 = 7671^2 + 2240^2 .

It is a cyclic number.

It is not a de Polignac number, because 63861841 - 2¹ = 63861839 is a prime.

Together with 63861839, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 63861841.

It is not a weakly prime, because it can be changed into another prime (63861821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31930920 + 31930921.

It is an arithmetic number, because the mean of its divisors is an integer number (31930921).

Almost surely, 2^63861841 is an apocalyptic number.

It is an amenable number.

63861841 is a deficient number, since it is larger than the sum of its proper divisors (1).

63861841 is an equidigital number, since it uses as much as digits as its factorization.

63861841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 37.

The square root of 63861841 is about 7991.3603973291. The cubic root of 63861841 is about 399.7119613842.

The spelling of 63861841 in words is "sixty-three million, eight hundred sixty-one thousand, eight hundred forty-one".