63836981 has 4 divisors (see below), whose sum is σ = 68747532. Its totient is φ = 58926432.

The previous prime is 63836953. The next prime is 63837013. The reversal of 63836981 is 18963836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32376100 + 31460881 = 5690^2 + 5609^2 .

It is a cyclic number.

It is not a de Polignac number, because 63836981 - 2¹⁸ = 63574837 is a prime.

It is a super-2 number, since 2×63836981² = 8150320286388722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63836281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2455256 + ... + 2455281.

It is an arithmetic number, because the mean of its divisors is an integer number (17186883).

Almost surely, 2^63836981 is an apocalyptic number.

It is an amenable number.

63836981 is a deficient number, since it is larger than the sum of its proper divisors (4910551).

63836981 is a wasteful number, since it uses less digits than its factorization.

63836981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4910550.

The product of its digits is 186624, while the sum is 44.

The square root of 63836981 is about 7989.8048161391. The cubic root of 63836981 is about 399.6600883153.

The spelling of 63836981 in words is "sixty-three million, eight hundred thirty-six thousand, nine hundred eighty-one".