51073909 has 2 divisors, whose sum is σ = 51073910. Its totient is φ = 51073908.

The previous prime is 51073907. The next prime is 51073943. The reversal of 51073909 is 90937015.

It is an a-pointer prime, because the next prime (51073943) can be obtained adding 51073909 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47651409 + 3422500 = 6903^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 51073909 - 2¹ = 51073907 is a prime.

Together with 51073907, 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 (51073907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25536954 + 25536955.

It is an arithmetic number, because the mean of its divisors is an integer number (25536955).

Almost surely, 2^51073909 is an apocalyptic number.

It is an amenable number.

51073909 is a deficient number, since it is larger than the sum of its proper divisors (1).

51073909 is an equidigital number, since it uses as much as digits as its factorization.

51073909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 51073909 is about 7146.6012201605. The cubic root of 51073909 is about 371.0220318552.

The spelling of 51073909 in words is "fifty-one million, seventy-three thousand, nine hundred nine".