51030509 has 2 divisors, whose sum is σ = 51030510. Its totient is φ = 51030508.

The previous prime is 51030449. The next prime is 51030533. The reversal of 51030509 is 90503015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31696900 + 19333609 = 5630^2 + 4397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51030509 is a prime.

It is a super-2 number, since 2×51030509² = 5208225697598162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51030569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25515254 + 25515255.

It is an arithmetic number, because the mean of its divisors is an integer number (25515255).

Almost surely, 2^51030509 is an apocalyptic number.

It is an amenable number.

51030509 is a deficient number, since it is larger than the sum of its proper divisors (1).

51030509 is an equidigital number, since it uses as much as digits as its factorization.

51030509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 675, while the sum is 23.

The square root of 51030509 is about 7143.5641664368. The cubic root of 51030509 is about 370.9169102145.

The spelling of 51030509 in words is "fifty-one million, thirty thousand, five hundred nine".