55545513 has 4 divisors (see below), whose sum is σ = 74060688. Its totient is φ = 37030340.

The previous prime is 55545499. The next prime is 55545559. The reversal of 55545513 is 31554555.

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.

It is a cyclic number.

It is not a de Polignac number, because 55545513 - 2¹² = 55541417 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55541513) 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, 9257583 + ... + 9257588.

It is an arithmetic number, because the mean of its divisors is an integer number (18515172).

Almost surely, 2^55545513 is an apocalyptic number.

It is an amenable number.

55545513 is a deficient number, since it is larger than the sum of its proper divisors (18515175).

55545513 is a wasteful number, since it uses less digits than its factorization.

55545513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18515174.

The product of its digits is 37500, while the sum is 33.

The square root of 55545513 is about 7452.8862194455. The cubic root of 55545513 is about 381.5484210862.

The spelling of 55545513 in words is "fifty-five million, five hundred forty-five thousand, five hundred thirteen".