55391503 has 4 divisors (see below), whose sum is σ = 55407168. Its totient is φ = 55375840.

The previous prime is 55391489. The next prime is 55391543. The reversal of 55391503 is 30519355.

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 55391503 - 2⁵ = 55391471 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55391543) 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, 258 + ... + 10528.

It is an arithmetic number, because the mean of its divisors is an integer number (13851792).

Almost surely, 2^55391503 is an apocalyptic number.

55391503 is a deficient number, since it is larger than the sum of its proper divisors (15665).

55391503 is a wasteful number, since it uses less digits than its factorization.

55391503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15664.

The product of its (nonzero) digits is 10125, while the sum is 31.

The square root of 55391503 is about 7442.5468087208. The cubic root of 55391503 is about 381.1954572874.

The spelling of 55391503 in words is "fifty-five million, three hundred ninety-one thousand, five hundred three".