51802549 has 2 divisors, whose sum is σ = 51802550. Its totient is φ = 51802548.

The previous prime is 51802547. The next prime is 51802567. The reversal of 51802549 is 94520815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31281649 + 20520900 = 5593^2 + 4530^2 .

It is a cyclic number.

It is not a de Polignac number, because 51802549 - 2¹ = 51802547 is a prime.

Together with 51802547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51802547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25901274 + 25901275.

It is an arithmetic number, because the mean of its divisors is an integer number (25901275).

Almost surely, 2^51802549 is an apocalyptic number.

It is an amenable number.

51802549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51802549 is an equidigital number, since it uses as much as digits as its factorization.

51802549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 51802549 is about 7197.3987662210. The cubic root of 51802549 is about 372.7780882154.

The spelling of 51802549 in words is "fifty-one million, eight hundred two thousand, five hundred forty-nine".