51375088309 has 4 divisors (see below), whose sum is σ = 52078856716. Its totient is φ = 50671319904.

The previous prime is 51375088307. The next prime is 51375088363. The reversal of 51375088309 is 90388057315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90388057315 = 5 ⋅18077611463.

It can be written as a sum of positive squares in 2 ways, for example, as 40076036100 + 11299052209 = 200190^2 + 106297^2 .

It is a cyclic number.

It is not a de Polignac number, because 51375088309 - 2¹ = 51375088307 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 (51375088307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351884094 + ... + 351884239.

It is an arithmetic number, because the mean of its divisors is an integer number (13019714179).

Almost surely, 2^51375088309 is an apocalyptic number.

It is an amenable number.

51375088309 is a deficient number, since it is larger than the sum of its proper divisors (703768407).

51375088309 is an equidigital number, since it uses as much as digits as its factorization.

51375088309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703768406.

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 51375088309 in words is "fifty-one billion, three hundred seventy-five million, eighty-eight thousand, three hundred nine".