63727861 has 2 divisors, whose sum is σ = 63727862. Its totient is φ = 63727860.

The previous prime is 63727841. The next prime is 63727891. The reversal of 63727861 is 16872736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47527236 + 16200625 = 6894^2 + 4025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63727861 is a prime.

It is a super-2 number, since 2×63727861² = 8122480535270642, which contains 22 as substring.

It is equal to p_3769825 and since 63727861 and 3769825 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63727841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31863930 + 31863931.

It is an arithmetic number, because the mean of its divisors is an integer number (31863931).

Almost surely, 2^63727861 is an apocalyptic number.

It is an amenable number.

63727861 is a deficient number, since it is larger than the sum of its proper divisors (1).

63727861 is an equidigital number, since it uses as much as digits as its factorization.

63727861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 63727861 is about 7982.9731929902. The cubic root of 63727861 is about 399.4322382478.

The spelling of 63727861 in words is "sixty-three million, seven hundred twenty-seven thousand, eight hundred sixty-one".