56172503 has 2 divisors, whose sum is σ = 56172504. Its totient is φ = 56172502.

The previous prime is 56172499. The next prime is 56172511. The reversal of 56172503 is 30527165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56172503 - 2² = 56172499 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56172533) 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 as a sum of consecutive naturals, namely, 28086251 + 28086252.

It is an arithmetic number, because the mean of its divisors is an integer number (28086252).

Almost surely, 2^56172503 is an apocalyptic number.

56172503 is a deficient number, since it is larger than the sum of its proper divisors (1).

56172503 is an equidigital number, since it uses as much as digits as its factorization.

56172503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 56172503 is about 7494.8317526146. The cubic root of 56172503 is about 382.9786747870.

Adding to 56172503 its reverse (30527165), we get a palindrome (86699668).

The spelling of 56172503 in words is "fifty-six million, one hundred seventy-two thousand, five hundred three".