51815798429 has 4 divisors (see below), whose sum is σ = 51905601084. Its totient is φ = 51725995776.

The previous prime is 51815798417. The next prime is 51815798449. The reversal of 51815798429 is 92489751815.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33234019204 + 18581779225 = 182302^2 + 136315^2 .

It is a cyclic number.

It is not a de Polignac number, because 51815798429 - 2⁴ = 51815798413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51815798449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44900462 + ... + 44901615.

It is an arithmetic number, because the mean of its divisors is an integer number (12976400271).

Almost surely, 2^51815798429 is an apocalyptic number.

It is an amenable number.

51815798429 is a deficient number, since it is larger than the sum of its proper divisors (89802655).

51815798429 is an equidigital number, since it uses as much as digits as its factorization.

51815798429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89802654.

The product of its digits is 7257600, while the sum is 59.

The spelling of 51815798429 in words is "fifty-one billion, eight hundred fifteen million, seven hundred ninety-eight thousand, four hundred twenty-nine".