51820037 has 2 divisors, whose sum is σ = 51820038. Its totient is φ = 51820036.

The previous prime is 51820009. The next prime is 51820039. The reversal of 51820037 is 73002815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50495236 + 1324801 = 7106^2 + 1151^2 .

It is a cyclic number.

It is not a de Polignac number, because 51820037 - 2¹⁰ = 51819013 is a prime.

Together with 51820039, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51819988 and 51820015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51820039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25910018 + 25910019.

It is an arithmetic number, because the mean of its divisors is an integer number (25910019).

Almost surely, 2^51820037 is an apocalyptic number.

It is an amenable number.

51820037 is a deficient number, since it is larger than the sum of its proper divisors (1).

51820037 is an equidigital number, since it uses as much as digits as its factorization.

51820037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 51820037 is about 7198.6135470659. The cubic root of 51820037 is about 372.8200321600.

The spelling of 51820037 in words is "fifty-one million, eight hundred twenty thousand, thirty-seven".