51690097 has 2 divisors, whose sum is σ = 51690098. Its totient is φ = 51690096.

The previous prime is 51690049. The next prime is 51690173. The reversal of 51690097 is 79009615.

51690097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44635761 + 7054336 = 6681^2 + 2656^2 .

It is a cyclic number.

It is not a de Polignac number, because 51690097 - 2⁷ = 51689969 is a prime.

It is a super-2 number, since 2×51690097² = 5343732255738818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51690797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25845048 + 25845049.

It is an arithmetic number, because the mean of its divisors is an integer number (25845049).

Almost surely, 2^51690097 is an apocalyptic number.

It is an amenable number.

51690097 is a deficient number, since it is larger than the sum of its proper divisors (1).

51690097 is an equidigital number, since it uses as much as digits as its factorization.

51690097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 51690097 is about 7189.5825330822. The cubic root of 51690097 is about 372.5081529078.

The spelling of 51690097 in words is "fifty-one million, six hundred ninety thousand, ninety-seven".