51330403 has 2 divisors, whose sum is σ = 51330404. Its totient is φ = 51330402.

The previous prime is 51330379. The next prime is 51330421. The reversal of 51330403 is 30403315.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51330403 is a prime.

It is not a weakly prime, because it can be changed into another prime (51330443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25665201 + 25665202.

It is an arithmetic number, because the mean of its divisors is an integer number (25665202).

Almost surely, 2^51330403 is an apocalyptic number.

51330403 is a deficient number, since it is larger than the sum of its proper divisors (1).

51330403 is an equidigital number, since it uses as much as digits as its factorization.

51330403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 51330403 is about 7164.5239199824. The cubic root of 51330403 is about 371.6420879222.

Adding to 51330403 its reverse (30403315), we get a palindrome (81733718).

The spelling of 51330403 in words is "fifty-one million, three hundred thirty thousand, four hundred three".