51724109 has 2 divisors, whose sum is σ = 51724110. Its totient is φ = 51724108.

The previous prime is 51724103. The next prime is 51724117. The reversal of 51724109 is 90142715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 386884 = 7165^2 + 622^2 .

It is a cyclic number.

It is not a de Polignac number, because 51724109 - 2⁴ = 51724093 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 (51724103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25862054 + 25862055.

It is an arithmetic number, because the mean of its divisors is an integer number (25862055).

Almost surely, 2^51724109 is an apocalyptic number.

It is an amenable number.

51724109 is a deficient number, since it is larger than the sum of its proper divisors (1).

51724109 is an equidigital number, since it uses as much as digits as its factorization.

51724109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 51724109 is about 7191.9475109319. The cubic root of 51724109 is about 372.5898382476.

The spelling of 51724109 in words is "fifty-one million, seven hundred twenty-four thousand, one hundred nine".