51429728123 has 2 divisors, whose sum is σ = 51429728124. Its totient is φ = 51429728122.

The previous prime is 51429728101. The next prime is 51429728153. The reversal of 51429728123 is 32182792415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51429728123 - 2³⁰ = 50355986299 is a prime.

It is not a weakly prime, because it can be changed into another prime (51429728153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25714864061 + 25714864062.

It is an arithmetic number, because the mean of its divisors is an integer number (25714864062).

Almost surely, 2^51429728123 is an apocalyptic number.

51429728123 is a deficient number, since it is larger than the sum of its proper divisors (1).

51429728123 is an equidigital number, since it uses as much as digits as its factorization.

51429728123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The spelling of 51429728123 in words is "fifty-one billion, four hundred twenty-nine million, seven hundred twenty-eight thousand, one hundred twenty-three".