54545521 has 4 divisors (see below), whose sum is σ = 55706112. Its totient is φ = 53384932.

The previous prime is 54545501. The next prime is 54545573. The reversal of 54545521 is 12554545.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12554545 = 5 ⋅2510909.

It is a cyclic number.

It is not a de Polignac number, because 54545521 - 2⁹ = 54545009 is a prime.

It is a super-2 number, since 2×54545521² = 5950427722322882, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54545501) 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, 580225 + ... + 580318.

It is an arithmetic number, because the mean of its divisors is an integer number (13926528).

Almost surely, 2^54545521 is an apocalyptic number.

It is an amenable number.

54545521 is a deficient number, since it is larger than the sum of its proper divisors (1160591).

54545521 is a wasteful number, since it uses less digits than its factorization.

54545521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160590.

The product of its digits is 20000, while the sum is 31.

The square root of 54545521 is about 7385.4939577526. The cubic root of 54545521 is about 379.2448553859.

The spelling of 54545521 in words is "fifty-four million, five hundred forty-five thousand, five hundred twenty-one".