51388903 has 2 divisors, whose sum is σ = 51388904. Its totient is φ = 51388902.

The previous prime is 51388891. The next prime is 51388921. The reversal of 51388903 is 30988315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51388903 - 2²¹ = 49291751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51388963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25694451 + 25694452.

It is an arithmetic number, because the mean of its divisors is an integer number (25694452).

Almost surely, 2^51388903 is an apocalyptic number.

51388903 is a deficient number, since it is larger than the sum of its proper divisors (1).

51388903 is an equidigital number, since it uses as much as digits as its factorization.

51388903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 51388903 is about 7168.6053734321. The cubic root of 51388903 is about 371.7832181092.

It can be divided in two parts, 5138 and 8903, that added together give a palindrome (14041).

The spelling of 51388903 in words is "fifty-one million, three hundred eighty-eight thousand, nine hundred three".