51681403 has 2 divisors, whose sum is σ = 51681404. Its totient is φ = 51681402.

The previous prime is 51681401. The next prime is 51681419. The reversal of 51681403 is 30418615.

51681403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51681403 - 2¹ = 51681401 is a prime.

Together with 51681401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51681401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25840701 + 25840702.

It is an arithmetic number, because the mean of its divisors is an integer number (25840702).

Almost surely, 2^51681403 is an apocalyptic number.

51681403 is a deficient number, since it is larger than the sum of its proper divisors (1).

51681403 is an equidigital number, since it uses as much as digits as its factorization.

51681403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 51681403 is about 7188.9778828426. The cubic root of 51681403 is about 372.4872671053.

The spelling of 51681403 in words is "fifty-one million, six hundred eighty-one thousand, four hundred three".