51372139940309 has 2 divisors, whose sum is σ = 51372139940310. Its totient is φ = 51372139940308.

The previous prime is 51372139940299. The next prime is 51372139940357. The reversal of 51372139940309 is 90304993127315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34356127188100 + 17016012752209 = 5861410^2 + 4125047^2 .

It is a cyclic number.

It is not a de Polignac number, because 51372139940309 - 2⁴ = 51372139940293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51372139940509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25686069970154 + 25686069970155.

It is an arithmetic number, because the mean of its divisors is an integer number (25686069970155).

Almost surely, 2^{51372139940309} is an apocalyptic number.

It is an amenable number.

51372139940309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51372139940309 is an equidigital number, since it uses as much as digits as its factorization.

51372139940309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5511240, while the sum is 56.

The spelling of 51372139940309 in words is "fifty-one trillion, three hundred seventy-two billion, one hundred thirty-nine million, nine hundred forty thousand, three hundred nine".