51997039 has 2 divisors, whose sum is σ = 51997040. Its totient is φ = 51997038.

The previous prime is 51997037. The next prime is 51997069. The reversal of 51997039 is 93079915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51997039 - 2¹ = 51997037 is a prime.

Together with 51997037, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 51996986 and 51997004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51997031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25998519 + 25998520.

It is an arithmetic number, because the mean of its divisors is an integer number (25998520).

Almost surely, 2^51997039 is an apocalyptic number.

51997039 is a deficient number, since it is larger than the sum of its proper divisors (1).

51997039 is an equidigital number, since it uses as much as digits as its factorization.

51997039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 51997039 is about 7210.8972395951. The cubic root of 51997039 is about 373.2440309540.

The spelling of 51997039 in words is "fifty-one million, nine hundred ninety-seven thousand, thirty-nine".