51097309 has 2 divisors, whose sum is σ = 51097310. Its totient is φ = 51097308.

The previous prime is 51097297. The next prime is 51097339. The reversal of 51097309 is 90379015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47403225 + 3694084 = 6885^2 + 1922^2 .

It is a cyclic number.

It is not a de Polignac number, because 51097309 - 2⁷ = 51097181 is a prime.

It is a super-2 number, since 2×51097309² = 5221869974082962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51097339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25548654 + 25548655.

It is an arithmetic number, because the mean of its divisors is an integer number (25548655).

Almost surely, 2^51097309 is an apocalyptic number.

It is an amenable number.

51097309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51097309 is an equidigital number, since it uses as much as digits as its factorization.

51097309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 51097309 is about 7148.2381745434. The cubic root of 51097309 is about 371.0786856350.

The spelling of 51097309 in words is "fifty-one million, ninety-seven thousand, three hundred nine".