54721537 has 4 divisors (see below), whose sum is σ = 58930900. Its totient is φ = 50512176.

The previous prime is 54721517. The next prime is 54721543. The reversal of 54721537 is 73512745.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19722481 + 34999056 = 4441^2 + 5916^2 .

It is not a de Polignac number, because 54721537 - 2¹⁵ = 54688769 is a prime.

It is a super-2 number, since 2×54721537² = 5988893223284738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54721517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2104662 + ... + 2104687.

It is an arithmetic number, because the mean of its divisors is an integer number (14732725).

Almost surely, 2^54721537 is an apocalyptic number.

It is an amenable number.

54721537 is a deficient number, since it is larger than the sum of its proper divisors (4209363).

54721537 is a wasteful number, since it uses less digits than its factorization.

54721537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209362.

The product of its digits is 29400, while the sum is 34.

The square root of 54721537 is about 7397.4006921350. The cubic root of 54721537 is about 379.6523528700.

The spelling of 54721537 in words is "fifty-four million, seven hundred twenty-one thousand, five hundred thirty-seven".