63963581 has 4 divisors (see below), whose sum is σ = 69778464. Its totient is φ = 58148700.

The previous prime is 63963547. The next prime is 63963583. The reversal of 63963581 is 18536936.

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 a cyclic number.

It is not a de Polignac number, because 63963581 - 2¹⁰ = 63962557 is a prime.

It is a super-2 number, since 2×63963581² = 8182679388687122, 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 (63963583) 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, 2907425 + ... + 2907446.

It is an arithmetic number, because the mean of its divisors is an integer number (17444616).

Almost surely, 2^63963581 is an apocalyptic number.

It is an amenable number.

63963581 is a deficient number, since it is larger than the sum of its proper divisors (5814883).

63963581 is a wasteful number, since it uses less digits than its factorization.

63963581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5814882.

The product of its digits is 116640, while the sum is 41.

The square root of 63963581 is about 7997.7234885935. The cubic root of 63963581 is about 399.9241126870.

The spelling of 63963581 in words is "sixty-three million, nine hundred sixty-three thousand, five hundred eighty-one".