56155503 has 4 divisors (see below), whose sum is σ = 74874008. Its totient is φ = 37437000.

The previous prime is 56155493. The next prime is 56155511. The reversal of 56155503 is 30555165.

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

It is not a de Polignac number, because 56155503 - 2⁶ = 56155439 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56155543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9359248 + ... + 9359253.

It is an arithmetic number, because the mean of its divisors is an integer number (18718502).

Almost surely, 2^56155503 is an apocalyptic number.

56155503 is a deficient number, since it is larger than the sum of its proper divisors (18718505).

56155503 is a wasteful number, since it uses less digits than its factorization.

56155503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18718504.

The product of its (nonzero) digits is 11250, while the sum is 30.

The square root of 56155503 is about 7493.6975519432. The cubic root of 56155503 is about 382.9400361054.

The spelling of 56155503 in words is "fifty-six million, one hundred fifty-five thousand, five hundred three".