51818513 has 2 divisors, whose sum is σ = 51818514. Its totient is φ = 51818512.

The previous prime is 51818489. The next prime is 51818521. The reversal of 51818513 is 31581815.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48678529 + 3139984 = 6977^2 + 1772^2 .

It is a cyclic number.

It is not a de Polignac number, because 51818513 - 2⁶ = 51818449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51818513.

It is not a weakly prime, because it can be changed into another prime (51818573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25909256 + 25909257.

It is an arithmetic number, because the mean of its divisors is an integer number (25909257).

Almost surely, 2^51818513 is an apocalyptic number.

It is an amenable number.

51818513 is a deficient number, since it is larger than the sum of its proper divisors (1).

51818513 is an equidigital number, since it uses as much as digits as its factorization.

51818513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 32.

The square root of 51818513 is about 7198.5076925707. The cubic root of 51818513 is about 372.8163773106.

The spelling of 51818513 in words is "fifty-one million, eight hundred eighteen thousand, five hundred thirteen".