51505109 has 2 divisors, whose sum is σ = 51505110. Its totient is φ = 51505108.

The previous prime is 51505093. The next prime is 51505123. The reversal of 51505109 is 90150515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47914084 + 3591025 = 6922^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 51505109 - 2⁴ = 51505093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51505159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25752554 + 25752555.

It is an arithmetic number, because the mean of its divisors is an integer number (25752555).

Almost surely, 2^51505109 is an apocalyptic number.

It is an amenable number.

51505109 is a deficient number, since it is larger than the sum of its proper divisors (1).

51505109 is an equidigital number, since it uses as much as digits as its factorization.

51505109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1125, while the sum is 26.

The square root of 51505109 is about 7176.7059992729. The cubic root of 51505109 is about 372.0632455962.

The spelling of 51505109 in words is "fifty-one million, five hundred five thousand, one hundred nine".