51312040399 has 6 divisors (see below), whose sum is σ = 52024579296. Its totient is φ = 50609130480.

The previous prime is 51312040369. The next prime is 51312040453. The reversal of 51312040399 is 99304021315.

It is not a de Polignac number, because 51312040399 - 2⁹ = 51312039887 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 (51312040349) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4809087 + ... + 4819744.

It is an arithmetic number, because the mean of its divisors is an integer number (8670763216).

Almost surely, 2^51312040399 is an apocalyptic number.

51312040399 is a deficient number, since it is larger than the sum of its proper divisors (712538897).

51312040399 is an frugal number, since it uses more digits than its factorization.

51312040399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9628977 (or 9628904 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The spelling of 51312040399 in words is "fifty-one billion, three hundred twelve million, forty thousand, three hundred ninety-nine".