63544981 has 8 divisors (see below), whose sum is σ = 64883000. Its totient is φ = 62216640.

The previous prime is 63544979. The next prime is 63545017. The reversal of 63544981 is 18944536.

It can be written as a sum of positive squares in 4 ways, for example, as 13205956 + 50339025 = 3634^2 + 7095^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63544981 - 2¹ = 63544979 is a prime.

It is a super-2 number, since 2×63544981² = 8075929220580722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63544931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11695 + ... + 16243.

It is an arithmetic number, because the mean of its divisors is an integer number (8110375).

Almost surely, 2^63544981 is an apocalyptic number.

63544981 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

63544981 is a deficient number, since it is larger than the sum of its proper divisors (1338019).

63544981 is a wasteful number, since it uses less digits than its factorization.

63544981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4839.

The product of its digits is 103680, while the sum is 40.

The square root of 63544981 is about 7971.5105845755. The cubic root of 63544981 is about 399.0497882816.

The spelling of 63544981 in words is "sixty-three million, five hundred forty-four thousand, nine hundred eighty-one".