51023125409 has 2 divisors, whose sum is σ = 51023125410. Its totient is φ = 51023125408.

The previous prime is 51023125397. The next prime is 51023125427. The reversal of 51023125409 is 90452132015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29207835409 + 21815290000 = 170903^2 + 147700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51023125409 is a prime.

It is not a weakly prime, because it can be changed into another prime (51023125429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25511562704 + 25511562705.

It is an arithmetic number, because the mean of its divisors is an integer number (25511562705).

Almost surely, 2^51023125409 is an apocalyptic number.

It is an amenable number.

51023125409 is a deficient number, since it is larger than the sum of its proper divisors (1).

51023125409 is an equidigital number, since it uses as much as digits as its factorization.

51023125409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 51023125409 in words is "fifty-one billion, twenty-three million, one hundred twenty-five thousand, four hundred nine".