51690937 has 2 divisors, whose sum is σ = 51690938. Its totient is φ = 51690936.

The previous prime is 51690923. The next prime is 51690941. The reversal of 51690937 is 73909615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51681721 + 9216 = 7189^2 + 96^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51690937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51690937.

It is not a weakly prime, because it can be changed into another prime (51690907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25845468 + 25845469.

It is an arithmetic number, because the mean of its divisors is an integer number (25845469).

Almost surely, 2^51690937 is an apocalyptic number.

It is an amenable number.

51690937 is a deficient number, since it is larger than the sum of its proper divisors (1).

51690937 is an equidigital number, since it uses as much as digits as its factorization.

51690937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 51690937 is about 7189.6409507012. The cubic root of 51690937 is about 372.5101707356.

The spelling of 51690937 in words is "fifty-one million, six hundred ninety thousand, nine hundred thirty-seven".