51225503 has 4 divisors (see below), whose sum is σ = 58543440. Its totient is φ = 43907568.

The previous prime is 51225491. The next prime is 51225509. The reversal of 51225503 is 30552215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30552215 = 5 ⋅6110443.

It is a cyclic number.

It is not a de Polignac number, because 51225503 - 2¹⁶ = 51159967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51225509) 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, 3658958 + ... + 3658971.

It is an arithmetic number, because the mean of its divisors is an integer number (14635860).

Almost surely, 2^51225503 is an apocalyptic number.

51225503 is a deficient number, since it is larger than the sum of its proper divisors (7317937).

51225503 is an equidigital number, since it uses as much as digits as its factorization.

51225503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7317936.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 51225503 is about 7157.1993824400. The cubic root of 51225503 is about 371.3887498094.

Adding to 51225503 its reverse (30552215), we get a palindrome (81777718).

The spelling of 51225503 in words is "fifty-one million, two hundred twenty-five thousand, five hundred three".