51480521 has 2 divisors, whose sum is σ = 51480522. Its totient is φ = 51480520.

The previous prime is 51480497. The next prime is 51480529. The reversal of 51480521 is 12508415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43414921 + 8065600 = 6589^2 + 2840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51480521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51480529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25740260 + 25740261.

It is an arithmetic number, because the mean of its divisors is an integer number (25740261).

Almost surely, 2^51480521 is an apocalyptic number.

It is an amenable number.

51480521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51480521 is an equidigital number, since it uses as much as digits as its factorization.

51480521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 51480521 is about 7174.9927526096. The cubic root of 51480521 is about 372.0040298057.

Adding to 51480521 its reverse (12508415), we get a palindrome (63988936).

The spelling of 51480521 in words is "fifty-one million, four hundred eighty thousand, five hundred twenty-one".