51155187389 has 2 divisors, whose sum is σ = 51155187390. Its totient is φ = 51155187388.

The previous prime is 51155187337. The next prime is 51155187401. The reversal of 51155187389 is 98378155115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50791636900 + 363550489 = 225370^2 + 19067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51155187389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51155187389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51155187089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25577593694 + 25577593695.

It is an arithmetic number, because the mean of its divisors is an integer number (25577593695).

Almost surely, 2^51155187389 is an apocalyptic number.

It is an amenable number.

51155187389 is a deficient number, since it is larger than the sum of its proper divisors (1).

51155187389 is an equidigital number, since it uses as much as digits as its factorization.

51155187389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512000, while the sum is 53.

The spelling of 51155187389 in words is "fifty-one billion, one hundred fifty-five million, one hundred eighty-seven thousand, three hundred eighty-nine".