54503521 has 4 divisors (see below), whose sum is σ = 54524932. Its totient is φ = 54482112.

The previous prime is 54503507. The next prime is 54503563. The reversal of 54503521 is 12530545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12530545 = 5 ⋅2506109.

It can be written as a sum of positive squares in 2 ways, for example, as 42393121 + 12110400 = 6511^2 + 3480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54503521 is a prime.

It is a super-3 number, since 3×54503521³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54503321) 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, 6276 + ... + 12181.

It is an arithmetic number, because the mean of its divisors is an integer number (13631233).

Almost surely, 2^54503521 is an apocalyptic number.

It is an amenable number.

54503521 is a deficient number, since it is larger than the sum of its proper divisors (21411).

54503521 is a wasteful number, since it uses less digits than its factorization.

54503521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21410.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 54503521 is about 7382.6499984762. The cubic root of 54503521 is about 379.1474909971.

The spelling of 54503521 in words is "fifty-four million, five hundred three thousand, five hundred twenty-one".