51003913 has 2 divisors, whose sum is σ = 51003914. Its totient is φ = 51003912.

The previous prime is 51003881. The next prime is 51003937. The reversal of 51003913 is 31930015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50523664 + 480249 = 7108^2 + 693^2 .

It is a cyclic number.

It is not a de Polignac number, because 51003913 - 2⁵ = 51003881 is a prime.

It is not a weakly prime, because it can be changed into another prime (51003943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25501956 + 25501957.

It is an arithmetic number, because the mean of its divisors is an integer number (25501957).

Almost surely, 2^51003913 is an apocalyptic number.

It is an amenable number.

51003913 is a deficient number, since it is larger than the sum of its proper divisors (1).

51003913 is an equidigital number, since it uses as much as digits as its factorization.

51003913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405, while the sum is 22.

The square root of 51003913 is about 7141.7023880865. The cubic root of 51003913 is about 370.8524610538.

Adding to 51003913 its reverse (31930015), we get a palindrome (82933928).

The spelling of 51003913 in words is "fifty-one million, three thousand, nine hundred thirteen".