63701221 has 2 divisors, whose sum is σ = 63701222. Its totient is φ = 63701220.

The previous prime is 63701213. The next prime is 63701251. The reversal of 63701221 is 12210736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44076321 + 19624900 = 6639^2 + 4430^2 .

It is a cyclic number.

It is not a de Polignac number, because 63701221 - 2³ = 63701213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63701192 and 63701201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63701201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31850610 + 31850611.

It is an arithmetic number, because the mean of its divisors is an integer number (31850611).

Almost surely, 2^63701221 is an apocalyptic number.

It is an amenable number.

63701221 is a deficient number, since it is larger than the sum of its proper divisors (1).

63701221 is an equidigital number, since it uses as much as digits as its factorization.

63701221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 63701221 is about 7981.3044673161. The cubic root of 63701221 is about 399.3765726005.

Adding to 63701221 its reverse (12210736), we get a palindrome (75911957).

The spelling of 63701221 in words is "sixty-three million, seven hundred one thousand, two hundred twenty-one".