55001603 has 4 divisors (see below), whose sum is σ = 56898240. Its totient is φ = 53104968.

The previous prime is 55001593. The next prime is 55001621. The reversal of 55001603 is 30610055.

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

It is a cyclic number.

It is not a de Polignac number, because 55001603 - 2⁴ = 55001587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55001003) 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, 948275 + ... + 948332.

It is an arithmetic number, because the mean of its divisors is an integer number (14224560).

Almost surely, 2^55001603 is an apocalyptic number.

55001603 is a deficient number, since it is larger than the sum of its proper divisors (1896637).

55001603 is a wasteful number, since it uses less digits than its factorization.

55001603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896636.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 55001603 is about 7416.3065605462. The cubic root of 55001603 is about 380.2989406662.

Adding to 55001603 its reverse (30610055), we get a palindrome (85611658).

The spelling of 55001603 in words is "fifty-five million, one thousand, six hundred three".