51252109 has 2 divisors, whose sum is σ = 51252110. Its totient is φ = 51252108.

The previous prime is 51252107. The next prime is 51252121. The reversal of 51252109 is 90125215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35964009 + 15288100 = 5997^2 + 3910^2 .

It is a cyclic number.

It is not a de Polignac number, because 51252109 - 2¹ = 51252107 is a prime.

Together with 51252107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51252107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25626054 + 25626055.

It is an arithmetic number, because the mean of its divisors is an integer number (25626055).

Almost surely, 2^51252109 is an apocalyptic number.

It is an amenable number.

51252109 is a deficient number, since it is larger than the sum of its proper divisors (1).

51252109 is an equidigital number, since it uses as much as digits as its factorization.

51252109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 51252109 is about 7159.0578290722. The cubic root of 51252109 is about 371.4530371810.

The spelling of 51252109 in words is "fifty-one million, two hundred fifty-two thousand, one hundred nine".