63552781 has 2 divisors, whose sum is σ = 63552782. Its totient is φ = 63552780.

The previous prime is 63552773. The next prime is 63552799. The reversal of 63552781 is 18725536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63441225 + 111556 = 7965^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 63552781 - 2³ = 63552773 is a prime.

It is a super-2 number, since 2×63552781² = 8077911945667922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 63552781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63559781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31776390 + 31776391.

It is an arithmetic number, because the mean of its divisors is an integer number (31776391).

Almost surely, 2^63552781 is an apocalyptic number.

It is an amenable number.

63552781 is a deficient number, since it is larger than the sum of its proper divisors (1).

63552781 is an equidigital number, since it uses as much as digits as its factorization.

63552781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 63552781 is about 7971.9998118414. Note that the first 3 decimals coincide. The cubic root of 63552781 is about 399.0661150943.

The spelling of 63552781 in words is "sixty-three million, five hundred fifty-two thousand, seven hundred eighty-one".