51818357 has 2 divisors, whose sum is σ = 51818358. Its totient is φ = 51818356.

The previous prime is 51818293. The next prime is 51818359. The reversal of 51818357 is 75381815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34562641 + 17255716 = 5879^2 + 4154^2 .

It is a cyclic number.

It is not a de Polignac number, because 51818357 - 2⁶ = 51818293 is a prime.

Together with 51818359, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51818357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51818359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25909178 + 25909179.

It is an arithmetic number, because the mean of its divisors is an integer number (25909179).

Almost surely, 2^51818357 is an apocalyptic number.

It is an amenable number.

51818357 is a deficient number, since it is larger than the sum of its proper divisors (1).

51818357 is an equidigital number, since it uses as much as digits as its factorization.

51818357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 38.

The square root of 51818357 is about 7198.4968569834. The cubic root of 51818357 is about 372.8160031881.

The spelling of 51818357 in words is "fifty-one million, eight hundred eighteen thousand, three hundred fifty-seven".