63145521 has 8 divisors (see below), whose sum is σ = 93548960. Its totient is φ = 42096996.

The previous prime is 63145469. The next prime is 63145549. The reversal of 63145521 is 12554136.

63145521 is a `hidden beast` number, since 631 + 4 + 5 + 5 + 21 = 666.

It is not a de Polignac number, because 63145521 - 2⁹ = 63145009 is a prime.

It is a super-2 number, since 2×63145521² = 7974713644722882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2338723 = 63145521 / (6 + 3 + 1 + 4 + 5 + 5 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63145921) 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, 1169335 + ... + 1169388.

It is an arithmetic number, because the mean of its divisors is an integer number (11693620).

Almost surely, 2^63145521 is an apocalyptic number.

It is an amenable number.

63145521 is a deficient number, since it is larger than the sum of its proper divisors (30403439).

63145521 is a wasteful number, since it uses less digits than its factorization.

63145521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338732 (or 2338726 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 63145521 is about 7946.4156070520. The cubic root of 63145521 is about 398.2118536599.

Adding to 63145521 its reverse (12554136), we get a palindrome (75699657).

The spelling of 63145521 in words is "sixty-three million, one hundred forty-five thousand, five hundred twenty-one".