51523709 has 2 divisors, whose sum is σ = 51523710. Its totient is φ = 51523708.

The previous prime is 51523673. The next prime is 51523727. The reversal of 51523709 is 90732515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51523684 + 25 = 7178^2 + 5^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51523709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51523009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25761854 + 25761855.

It is an arithmetic number, because the mean of its divisors is an integer number (25761855).

Almost surely, 2^51523709 is an apocalyptic number.

It is an amenable number.

51523709 is a deficient number, since it is larger than the sum of its proper divisors (1).

51523709 is an equidigital number, since it uses as much as digits as its factorization.

51523709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 51523709 is about 7178.0017414319. The cubic root of 51523709 is about 372.1080278428.

The spelling of 51523709 in words is "fifty-one million, five hundred twenty-three thousand, seven hundred nine".