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63881221 is a prime number
BaseRepresentation
bin1111001110110…
…0000000000101
311110012111120011
43303230000011
5112323144341
610201110221
71403660425
oct363540005
9143174504
1063881221
11330719a8
1219488371
1310308751
1486ac485
15591cb81
hex3cec005

63881221 has 2 divisors, whose sum is σ = 63881222. Its totient is φ = 63881220.

The previous prime is 63881201. The next prime is 63881227. The reversal of 63881221 is 12218836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60233121 + 3648100 = 7761^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 63881221 - 27 = 63881093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63881227) 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, 31940610 + 31940611.

It is an arithmetic number, because the mean of its divisors is an integer number (31940611).

Almost surely, 263881221 is an apocalyptic number.

It is an amenable number.

63881221 is a deficient number, since it is larger than the sum of its proper divisors (1).

63881221 is an equidigital number, since it uses as much as digits as its factorization.

63881221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 63881221 is about 7992.5728648540. The cubic root of 63881221 is about 399.7523905055.

The spelling of 63881221 in words is "sixty-three million, eight hundred eighty-one thousand, two hundred twenty-one".