55113551 has 4 divisors (see below), whose sum is σ = 55129152. Its totient is φ = 55097952.

The previous prime is 55113533. The next prime is 55113559. The reversal of 55113551 is 15531155.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55113551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55113551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55113559) 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, 311 + ... + 10503.

It is an arithmetic number, because the mean of its divisors is an integer number (13782288).

Almost surely, 2^55113551 is an apocalyptic number.

55113551 is a deficient number, since it is larger than the sum of its proper divisors (15601).

55113551 is a wasteful number, since it uses less digits than its factorization.

55113551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15600.

The product of its digits is 1875, while the sum is 26.

The square root of 55113551 is about 7423.8501466557. The cubic root of 55113551 is about 380.5567807523.

The spelling of 55113551 in words is "fifty-five million, one hundred thirteen thousand, five hundred fifty-one".