54145521 has 12 divisors (see below), whose sum is σ = 78480948. Its totient is φ = 35972064.

The previous prime is 54145517. The next prime is 54145537. The reversal of 54145521 is 12554145.

It can be written as a sum of positive squares in 2 ways, for example, as 45360225 + 8785296 = 6735^2 + 2964^2 .

It is not a de Polignac number, because 54145521 - 2² = 54145517 is a prime.

It is a super-2 number, since 2×54145521² = 5863474888722882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (54145501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7630 + ... + 12903.

It is an arithmetic number, because the mean of its divisors is an integer number (6540079).

Almost surely, 2^54145521 is an apocalyptic number.

It is an amenable number.

54145521 is a deficient number, since it is larger than the sum of its proper divisors (24335427).

54145521 is a wasteful number, since it uses less digits than its factorization.

54145521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20832 (or 20829 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 54145521 is about 7358.3640165461. The cubic root of 54145521 is about 378.3155381583.

Adding to 54145521 its reverse (12554145), we get a palindrome (66699666).

The spelling of 54145521 in words is "fifty-four million, one hundred forty-five thousand, five hundred twenty-one".