63481809 has 4 divisors (see below), whose sum is σ = 84642416. Its totient is φ = 42321204.

The previous prime is 63481807. The next prime is 63481811. The reversal of 63481809 is 90818436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (63481807) and next prime (63481811).

It is not a de Polignac number, because 63481809 - 2¹ = 63481807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63481801) 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, 10580299 + ... + 10580304.

It is an arithmetic number, because the mean of its divisors is an integer number (21160604).

Almost surely, 2^63481809 is an apocalyptic number.

It is an amenable number.

63481809 is a deficient number, since it is larger than the sum of its proper divisors (21160607).

63481809 is a wasteful number, since it uses less digits than its factorization.

63481809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21160606.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 63481809 is about 7967.5472386425. The cubic root of 63481809 is about 398.9175085901.

The spelling of 63481809 in words is "sixty-three million, four hundred eighty-one thousand, eight hundred nine".