51261310187 has 2 divisors, whose sum is σ = 51261310188. Its totient is φ = 51261310186.

The previous prime is 51261310117. The next prime is 51261310231. The reversal of 51261310187 is 78101316215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51261310187 - 2¹⁰ = 51261309163 is a prime.

It is not a weakly prime, because it can be changed into another prime (51261310117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25630655093 + 25630655094.

It is an arithmetic number, because the mean of its divisors is an integer number (25630655094).

Almost surely, 2^51261310187 is an apocalyptic number.

51261310187 is a deficient number, since it is larger than the sum of its proper divisors (1).

51261310187 is an equidigital number, since it uses as much as digits as its factorization.

51261310187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 35.

The spelling of 51261310187 in words is "fifty-one billion, two hundred sixty-one million, three hundred ten thousand, one hundred eighty-seven".