55610521 has 4 divisors (see below), whose sum is σ = 55800612. Its totient is φ = 55420432.

The previous prime is 55610491. The next prime is 55610531. The reversal of 55610521 is 12501655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12501655 = 5 ⋅2500331.

It can be written as a sum of positive squares in 2 ways, for example, as 24641296 + 30969225 = 4964^2 + 5565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55610521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55610531) 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, 94606 + ... + 95191.

It is an arithmetic number, because the mean of its divisors is an integer number (13950153).

Almost surely, 2^55610521 is an apocalyptic number.

It is an amenable number.

55610521 is a deficient number, since it is larger than the sum of its proper divisors (190091).

55610521 is a wasteful number, since it uses less digits than its factorization.

55610521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190090.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 55610521 is about 7457.2462075487. The cubic root of 55610521 is about 381.6972121605.

The spelling of 55610521 in words is "fifty-five million, six hundred ten thousand, five hundred twenty-one".